chore: regens API reference docs (#889)

diff --git a/docs/dyn/content_v2.pos.html b/docs/dyn/content_v2.pos.html
index 3e1276a..1a00951 100644
--- a/docs/dyn/content_v2.pos.html
+++ b/docs/dyn/content_v2.pos.html
@@ -75,7 +75,7 @@
 <h1><a href="content_v2.html">Content API for Shopping</a> . <a href="content_v2.pos.html">pos</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#custombatch">custombatch(body, dryRun=None)</a></code></p>
+  <code><a href="#custombatch">custombatch(body=None, dryRun=None)</a></code></p>
 <p class="firstline">Batches multiple POS-related calls in a single request.</p>
 <p class="toc_element">
   <code><a href="#delete">delete(merchantId, targetMerchantId, storeCode, dryRun=None)</a></code></p>
@@ -84,67 +84,74 @@
   <code><a href="#get">get(merchantId, targetMerchantId, storeCode)</a></code></p>
 <p class="firstline">Retrieves information about the given store.</p>
 <p class="toc_element">
-  <code><a href="#insert">insert(merchantId, targetMerchantId, body, dryRun=None)</a></code></p>
+  <code><a href="#insert">insert(merchantId, targetMerchantId, body=None, dryRun=None)</a></code></p>
 <p class="firstline">Creates a store for the given merchant.</p>
 <p class="toc_element">
-  <code><a href="#inventory">inventory(merchantId, targetMerchantId, body, dryRun=None)</a></code></p>
+  <code><a href="#inventory">inventory(merchantId, targetMerchantId, body=None, dryRun=None)</a></code></p>
 <p class="firstline">Submit inventory for the given merchant.</p>
 <p class="toc_element">
   <code><a href="#list">list(merchantId, targetMerchantId)</a></code></p>
 <p class="firstline">Lists the stores of the target merchant.</p>
 <p class="toc_element">
-  <code><a href="#sale">sale(merchantId, targetMerchantId, body, dryRun=None)</a></code></p>
+  <code><a href="#sale">sale(merchantId, targetMerchantId, body=None, dryRun=None)</a></code></p>
 <p class="firstline">Submit a sale event for the given merchant.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="custombatch">custombatch(body, dryRun=None)</code>
+    <code class="details" id="custombatch">custombatch(body=None, dryRun=None)</code>
   <pre>Batches multiple POS-related calls in a single request.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {
     "entries": [ # The request entries to be processed in the batch.
       {
-        "storeCode": "A String", # The store code. Set this only if the method is delete or get.
+        "storeCode": "A String", # The store code. Set this only if the method is `delete` or `get`.
         "targetMerchantId": "A String", # The ID of the account for which to get/submit data.
-        "sale": { # The change of the available quantity of an item at the given store. # The sale information to submit. Set this only if the method is sale.
-          "itemId": "A String", # A unique identifier for the item.
-          "storeCode": "A String", # The identifier of the merchant's store. Either a storeCode inserted via the API or the code of the store in Google My Business.
-          "kind": "content#posSale", # Identifies what kind of resource this is. Value: the fixed string "content#posSale".
-          "contentLanguage": "A String", # The two-letter ISO 639-1 language code for the item.
-          "timestamp": "A String", # The inventory timestamp, in ISO 8601 format.
-          "price": { # The price of the item.
+        "sale": { # The change of the available quantity of an item at the given store. # The sale information to submit. Set this only if the method is `sale`.
+          "itemId": "A String", # Required. A unique identifier for the item.
+          "storeCode": "A String", # Required. The identifier of the merchant's store. Either a `storeCode` inserted via the API or the code of the store in Google My Business.
+          "kind": "content#posSale", # Identifies what kind of resource this is. Value: the fixed string "`content#posSale`"
+          "contentLanguage": "A String", # Required. The two-letter ISO 639-1 language code for the item.
+          "timestamp": "A String", # Required. The inventory timestamp, in ISO 8601 format.
+          "price": { # Required. The price of the item.
             "currency": "A String", # The currency of the price.
             "value": "A String", # The price represented as a number.
           },
-          "targetCountry": "A String", # The CLDR territory code for the item.
+          "targetCountry": "A String", # Required. The CLDR territory code for the item.
           "gtin": "A String", # Global Trade Item Number.
           "saleId": "A String", # A unique ID to group items from the same sale event.
-          "quantity": "A String", # The relative change of the available quantity. Negative for items returned.
+          "quantity": "A String", # Required. The relative change of the available quantity. Negative for items returned.
         },
         "merchantId": "A String", # The ID of the POS data provider.
         "batchId": 42, # An entry ID, unique within the batch request.
-        "inventory": { # The absolute quantity of an item available at the given store. # The inventory to submit. Set this only if the method is inventory.
-          "itemId": "A String", # A unique identifier for the item.
-          "storeCode": "A String", # The identifier of the merchant's store. Either a storeCode inserted via the API or the code of the store in Google My Business.
-          "kind": "content#posInventory", # Identifies what kind of resource this is. Value: the fixed string "content#posInventory".
-          "contentLanguage": "A String", # The two-letter ISO 639-1 language code for the item.
-          "timestamp": "A String", # The inventory timestamp, in ISO 8601 format.
-          "price": { # The current price of the item.
+        "inventory": { # The absolute quantity of an item available at the given store. # The inventory to submit. Set this only if the method is `inventory`.
+          "itemId": "A String", # Required. A unique identifier for the item.
+          "storeCode": "A String", # Required. The identifier of the merchant's store. Either a `storeCode` inserted via the API or the code of the store in Google My Business.
+          "kind": "content#posInventory", # Identifies what kind of resource this is. Value: the fixed string "`content#posInventory`"
+          "contentLanguage": "A String", # Required. The two-letter ISO 639-1 language code for the item.
+          "timestamp": "A String", # Required. The inventory timestamp, in ISO 8601 format.
+          "price": { # Required. The current price of the item.
             "currency": "A String", # The currency of the price.
             "value": "A String", # The price represented as a number.
           },
-          "targetCountry": "A String", # The CLDR territory code for the item.
+          "targetCountry": "A String", # Required. The CLDR territory code for the item.
           "gtin": "A String", # Global Trade Item Number.
-          "quantity": "A String", # The available quantity of the item.
+          "quantity": "A String", # Required. The available quantity of the item.
         },
-        "method": "A String",
-        "store": { # Store resource. # The store information to submit. Set this only if the method is insert.
-            "storeAddress": "A String", # The street address of the store.
-            "kind": "content#posStore", # Identifies what kind of resource this is. Value: the fixed string "content#posStore".
-            "storeCode": "A String", # A store identifier that is unique for the given merchant.
+        "method": "A String", # The method of the batch entry.
+            #
+            # Acceptable values are:
+            # - "`delete`"
+            # - "`get`"
+            # - "`insert`"
+            # - "`inventory`"
+            # - "`sale`"
+        "store": { # Store resource. # The store information to submit. Set this only if the method is `insert`.
+            "storeAddress": "A String", # Required. The street address of the store.
+            "kind": "content#posStore", # Identifies what kind of resource this is. Value: the fixed string "`content#posStore`"
+            "storeCode": "A String", # Required. A store identifier that is unique for the given merchant.
           },
       },
     ],
@@ -159,10 +166,10 @@
     "kind": "content#posCustomBatchResponse", # Identifies what kind of resource this is. Value: the fixed string "content#posCustomBatchResponse".
     "entries": [ # The result of the execution of the batch requests.
       {
-        "kind": "content#posCustomBatchResponseEntry", # Identifies what kind of resource this is. Value: the fixed string "content#posCustomBatchResponseEntry".
+        "kind": "content#posCustomBatchResponseEntry", # Identifies what kind of resource this is. Value: the fixed string "`content#posCustomBatchResponseEntry`"
         "errors": { # A list of errors returned by a failed batch entry. # A list of errors defined if, and only if, the request failed.
-          "message": "A String", # The message of the first error in errors.
-          "code": 42, # The HTTP status of the first error in errors.
+          "message": "A String", # The message of the first error in `errors`.
+          "code": 42, # The HTTP status of the first error in `errors`.
           "errors": [ # A list of errors.
             { # An error returned by the API.
               "reason": "A String", # The error code.
@@ -172,39 +179,39 @@
           ],
         },
         "sale": { # The change of the available quantity of an item at the given store. # The updated sale information.
-          "itemId": "A String", # A unique identifier for the item.
-          "storeCode": "A String", # The identifier of the merchant's store. Either a storeCode inserted via the API or the code of the store in Google My Business.
-          "kind": "content#posSale", # Identifies what kind of resource this is. Value: the fixed string "content#posSale".
-          "contentLanguage": "A String", # The two-letter ISO 639-1 language code for the item.
-          "timestamp": "A String", # The inventory timestamp, in ISO 8601 format.
-          "price": { # The price of the item.
+          "itemId": "A String", # Required. A unique identifier for the item.
+          "storeCode": "A String", # Required. The identifier of the merchant's store. Either a `storeCode` inserted via the API or the code of the store in Google My Business.
+          "kind": "content#posSale", # Identifies what kind of resource this is. Value: the fixed string "`content#posSale`"
+          "contentLanguage": "A String", # Required. The two-letter ISO 639-1 language code for the item.
+          "timestamp": "A String", # Required. The inventory timestamp, in ISO 8601 format.
+          "price": { # Required. The price of the item.
             "currency": "A String", # The currency of the price.
             "value": "A String", # The price represented as a number.
           },
-          "targetCountry": "A String", # The CLDR territory code for the item.
+          "targetCountry": "A String", # Required. The CLDR territory code for the item.
           "gtin": "A String", # Global Trade Item Number.
           "saleId": "A String", # A unique ID to group items from the same sale event.
-          "quantity": "A String", # The relative change of the available quantity. Negative for items returned.
+          "quantity": "A String", # Required. The relative change of the available quantity. Negative for items returned.
         },
         "batchId": 42, # The ID of the request entry to which this entry responds.
         "inventory": { # The absolute quantity of an item available at the given store. # The updated inventory information.
-          "itemId": "A String", # A unique identifier for the item.
-          "storeCode": "A String", # The identifier of the merchant's store. Either a storeCode inserted via the API or the code of the store in Google My Business.
-          "kind": "content#posInventory", # Identifies what kind of resource this is. Value: the fixed string "content#posInventory".
-          "contentLanguage": "A String", # The two-letter ISO 639-1 language code for the item.
-          "timestamp": "A String", # The inventory timestamp, in ISO 8601 format.
-          "price": { # The current price of the item.
+          "itemId": "A String", # Required. A unique identifier for the item.
+          "storeCode": "A String", # Required. The identifier of the merchant's store. Either a `storeCode` inserted via the API or the code of the store in Google My Business.
+          "kind": "content#posInventory", # Identifies what kind of resource this is. Value: the fixed string "`content#posInventory`"
+          "contentLanguage": "A String", # Required. The two-letter ISO 639-1 language code for the item.
+          "timestamp": "A String", # Required. The inventory timestamp, in ISO 8601 format.
+          "price": { # Required. The current price of the item.
             "currency": "A String", # The currency of the price.
             "value": "A String", # The price represented as a number.
           },
-          "targetCountry": "A String", # The CLDR territory code for the item.
+          "targetCountry": "A String", # Required. The CLDR territory code for the item.
           "gtin": "A String", # Global Trade Item Number.
-          "quantity": "A String", # The available quantity of the item.
+          "quantity": "A String", # Required. The available quantity of the item.
         },
         "store": { # Store resource. # The retrieved or updated store information.
-            "storeAddress": "A String", # The street address of the store.
-            "kind": "content#posStore", # Identifies what kind of resource this is. Value: the fixed string "content#posStore".
-            "storeCode": "A String", # A store identifier that is unique for the given merchant.
+            "storeAddress": "A String", # Required. The street address of the store.
+            "kind": "content#posStore", # Identifies what kind of resource this is. Value: the fixed string "`content#posStore`"
+            "storeCode": "A String", # Required. A store identifier that is unique for the given merchant.
           },
       },
     ],
@@ -236,26 +243,26 @@
   An object of the form:
 
     { # Store resource.
-      "storeAddress": "A String", # The street address of the store.
-      "kind": "content#posStore", # Identifies what kind of resource this is. Value: the fixed string "content#posStore".
-      "storeCode": "A String", # A store identifier that is unique for the given merchant.
+      "storeAddress": "A String", # Required. The street address of the store.
+      "kind": "content#posStore", # Identifies what kind of resource this is. Value: the fixed string "`content#posStore`"
+      "storeCode": "A String", # Required. A store identifier that is unique for the given merchant.
     }</pre>
 </div>
 
 <div class="method">
-    <code class="details" id="insert">insert(merchantId, targetMerchantId, body, dryRun=None)</code>
+    <code class="details" id="insert">insert(merchantId, targetMerchantId, body=None, dryRun=None)</code>
   <pre>Creates a store for the given merchant.
 
 Args:
   merchantId: string, The ID of the POS or inventory data provider. (required)
   targetMerchantId: string, The ID of the target merchant. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Store resource.
-    "storeAddress": "A String", # The street address of the store.
-    "kind": "content#posStore", # Identifies what kind of resource this is. Value: the fixed string "content#posStore".
-    "storeCode": "A String", # A store identifier that is unique for the given merchant.
+    "storeAddress": "A String", # Required. The street address of the store.
+    "kind": "content#posStore", # Identifies what kind of resource this is. Value: the fixed string "`content#posStore`"
+    "storeCode": "A String", # Required. A store identifier that is unique for the given merchant.
   }
 
   dryRun: boolean, Flag to simulate a request like in a live environment. If set to true, dry-run mode checks the validity of the request and returns errors (if any).
@@ -264,34 +271,34 @@
   An object of the form:
 
     { # Store resource.
-      "storeAddress": "A String", # The street address of the store.
-      "kind": "content#posStore", # Identifies what kind of resource this is. Value: the fixed string "content#posStore".
-      "storeCode": "A String", # A store identifier that is unique for the given merchant.
+      "storeAddress": "A String", # Required. The street address of the store.
+      "kind": "content#posStore", # Identifies what kind of resource this is. Value: the fixed string "`content#posStore`"
+      "storeCode": "A String", # Required. A store identifier that is unique for the given merchant.
     }</pre>
 </div>
 
 <div class="method">
-    <code class="details" id="inventory">inventory(merchantId, targetMerchantId, body, dryRun=None)</code>
+    <code class="details" id="inventory">inventory(merchantId, targetMerchantId, body=None, dryRun=None)</code>
   <pre>Submit inventory for the given merchant.
 
 Args:
   merchantId: string, The ID of the POS or inventory data provider. (required)
   targetMerchantId: string, The ID of the target merchant. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {
-    "itemId": "A String", # A unique identifier for the item.
-    "storeCode": "A String", # The identifier of the merchant's store. Either a storeCode inserted via the API or the code of the store in Google My Business.
-    "targetCountry": "A String", # The CLDR territory code for the item.
-    "contentLanguage": "A String", # The two-letter ISO 639-1 language code for the item.
-    "timestamp": "A String", # The inventory timestamp, in ISO 8601 format.
-    "price": { # The current price of the item.
+    "itemId": "A String", # Required. A unique identifier for the item.
+    "storeCode": "A String", # Required. The identifier of the merchant's store. Either a `storeCode` inserted via the API or the code of the store in Google My Business.
+    "targetCountry": "A String", # Required. The CLDR territory code for the item.
+    "contentLanguage": "A String", # Required. The two-letter ISO 639-1 language code for the item.
+    "timestamp": "A String", # Required. The inventory timestamp, in ISO 8601 format.
+    "price": { # Required. The current price of the item.
       "currency": "A String", # The currency of the price.
       "value": "A String", # The price represented as a number.
     },
     "gtin": "A String", # Global Trade Item Number.
-    "quantity": "A String", # The available quantity of the item.
+    "quantity": "A String", # Required. The available quantity of the item.
   }
 
   dryRun: boolean, Flag to simulate a request like in a live environment. If set to true, dry-run mode checks the validity of the request and returns errors (if any).
@@ -300,18 +307,18 @@
   An object of the form:
 
     {
-    "itemId": "A String", # A unique identifier for the item.
-    "storeCode": "A String", # The identifier of the merchant's store. Either a storeCode inserted via the API or the code of the store in Google My Business.
+    "itemId": "A String", # Required. A unique identifier for the item.
+    "storeCode": "A String", # Required. The identifier of the merchant's store. Either a `storeCode` inserted via the API or the code of the store in Google My Business.
     "kind": "content#posInventoryResponse", # Identifies what kind of resource this is. Value: the fixed string "content#posInventoryResponse".
-    "contentLanguage": "A String", # The two-letter ISO 639-1 language code for the item.
-    "timestamp": "A String", # The inventory timestamp, in ISO 8601 format.
-    "price": { # The current price of the item.
+    "contentLanguage": "A String", # Required. The two-letter ISO 639-1 language code for the item.
+    "timestamp": "A String", # Required. The inventory timestamp, in ISO 8601 format.
+    "price": { # Required. The current price of the item.
       "currency": "A String", # The currency of the price.
       "value": "A String", # The price represented as a number.
     },
-    "targetCountry": "A String", # The CLDR territory code for the item.
+    "targetCountry": "A String", # Required. The CLDR territory code for the item.
     "gtin": "A String", # Global Trade Item Number.
-    "quantity": "A String", # The available quantity of the item.
+    "quantity": "A String", # Required. The available quantity of the item.
   }</pre>
 </div>
 
@@ -330,37 +337,37 @@
     "kind": "content#posListResponse", # Identifies what kind of resource this is. Value: the fixed string "content#posListResponse".
     "resources": [
       { # Store resource.
-          "storeAddress": "A String", # The street address of the store.
-          "kind": "content#posStore", # Identifies what kind of resource this is. Value: the fixed string "content#posStore".
-          "storeCode": "A String", # A store identifier that is unique for the given merchant.
+          "storeAddress": "A String", # Required. The street address of the store.
+          "kind": "content#posStore", # Identifies what kind of resource this is. Value: the fixed string "`content#posStore`"
+          "storeCode": "A String", # Required. A store identifier that is unique for the given merchant.
         },
     ],
   }</pre>
 </div>
 
 <div class="method">
-    <code class="details" id="sale">sale(merchantId, targetMerchantId, body, dryRun=None)</code>
+    <code class="details" id="sale">sale(merchantId, targetMerchantId, body=None, dryRun=None)</code>
   <pre>Submit a sale event for the given merchant.
 
 Args:
   merchantId: string, The ID of the POS or inventory data provider. (required)
   targetMerchantId: string, The ID of the target merchant. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 {
-    "itemId": "A String", # A unique identifier for the item.
-    "storeCode": "A String", # The identifier of the merchant's store. Either a storeCode inserted via the API or the code of the store in Google My Business.
-    "targetCountry": "A String", # The CLDR territory code for the item.
-    "contentLanguage": "A String", # The two-letter ISO 639-1 language code for the item.
-    "timestamp": "A String", # The inventory timestamp, in ISO 8601 format.
-    "price": { # The price of the item.
+    "itemId": "A String", # Required. A unique identifier for the item.
+    "storeCode": "A String", # Required. The identifier of the merchant's store. Either a `storeCode` inserted via the API or the code of the store in Google My Business.
+    "targetCountry": "A String", # Required. The CLDR territory code for the item.
+    "contentLanguage": "A String", # Required. The two-letter ISO 639-1 language code for the item.
+    "timestamp": "A String", # Required. The inventory timestamp, in ISO 8601 format.
+    "price": { # Required. The price of the item.
       "currency": "A String", # The currency of the price.
       "value": "A String", # The price represented as a number.
     },
     "saleId": "A String", # A unique ID to group items from the same sale event.
     "gtin": "A String", # Global Trade Item Number.
-    "quantity": "A String", # The relative change of the available quantity. Negative for items returned.
+    "quantity": "A String", # Required. The relative change of the available quantity. Negative for items returned.
   }
 
   dryRun: boolean, Flag to simulate a request like in a live environment. If set to true, dry-run mode checks the validity of the request and returns errors (if any).
@@ -369,19 +376,19 @@
   An object of the form:
 
     {
-    "itemId": "A String", # A unique identifier for the item.
-    "storeCode": "A String", # The identifier of the merchant's store. Either a storeCode inserted via the API or the code of the store in Google My Business.
+    "itemId": "A String", # Required. A unique identifier for the item.
+    "storeCode": "A String", # Required. The identifier of the merchant's store. Either a `storeCode` inserted via the API or the code of the store in Google My Business.
     "kind": "content#posSaleResponse", # Identifies what kind of resource this is. Value: the fixed string "content#posSaleResponse".
-    "contentLanguage": "A String", # The two-letter ISO 639-1 language code for the item.
-    "timestamp": "A String", # The inventory timestamp, in ISO 8601 format.
-    "price": { # The price of the item.
+    "contentLanguage": "A String", # Required. The two-letter ISO 639-1 language code for the item.
+    "timestamp": "A String", # Required. The inventory timestamp, in ISO 8601 format.
+    "price": { # Required. The price of the item.
       "currency": "A String", # The currency of the price.
       "value": "A String", # The price represented as a number.
     },
-    "targetCountry": "A String", # The CLDR territory code for the item.
+    "targetCountry": "A String", # Required. The CLDR territory code for the item.
     "gtin": "A String", # Global Trade Item Number.
     "saleId": "A String", # A unique ID to group items from the same sale event.
-    "quantity": "A String", # The relative change of the available quantity. Negative for items returned.
+    "quantity": "A String", # Required. The relative change of the available quantity. Negative for items returned.
   }</pre>
 </div>