chore: regens API reference docs (#889)

diff --git a/docs/dyn/content_v2.accounttax.html b/docs/dyn/content_v2.accounttax.html
index 6601618..98c9fef 100644
--- a/docs/dyn/content_v2.accounttax.html
+++ b/docs/dyn/content_v2.accounttax.html
@@ -75,7 +75,7 @@
 <h1><a href="content_v2.html">Content API for Shopping</a> . <a href="content_v2.accounttax.html">accounttax</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">Retrieves and updates tax settings of multiple accounts in a single request.</p>
 <p class="toc_element">
   <code><a href="#get">get(merchantId, accountId)</a></code></p>
@@ -87,37 +87,38 @@
   <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
 <p class="firstline">Retrieves the next page of results.</p>
 <p class="toc_element">
-  <code><a href="#patch">patch(merchantId, accountId, body, dryRun=None)</a></code></p>
-<p class="firstline">Updates the tax settings of the account. This method supports patch semantics.</p>
-<p class="toc_element">
-  <code><a href="#update">update(merchantId, accountId, body, dryRun=None)</a></code></p>
+  <code><a href="#update">update(merchantId, accountId, body=None, dryRun=None)</a></code></p>
 <p class="firstline">Updates the tax settings of the account.</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>Retrieves and updates tax settings of multiple accounts 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.
       { # A batch entry encoding a single non-batch accounttax request.
         "batchId": 42, # An entry ID, unique within the batch request.
-        "method": "A String",
-        "accountTax": { # The tax settings of a merchant account. All methods require the admin role. # The account tax settings to update. Only defined if the method is update.
+        "method": "A String", # The method of the batch entry.
+            #
+            # Acceptable values are:
+            # - "`get`"
+            # - "`update`"
+        "accountTax": { # The tax settings of a merchant account. All methods require the admin role. # The account tax settings to update. Only defined if the method is `update`.
           "rules": [ # Tax rules. Updating the tax rules will enable US taxes (not reversible). Defining no rules is equivalent to not charging tax at all.
             { # Tax calculation rule to apply in a state or province (USA only).
               "country": "A String", # Country code in which tax is applicable.
               "ratePercent": "A String", # Explicit tax rate in percent, represented as a floating point number without the percentage character. Must not be negative.
               "shippingTaxed": True or False, # If true, shipping charges are also taxed.
-              "locationId": "A String", # State (or province) is which the tax is applicable, described by its location ID (also called criteria ID).
+              "locationId": "A String", # Required. State (or province) is which the tax is applicable, described by its location ID (also called criteria ID).
               "useGlobalRate": True or False, # Whether the tax rate is taken from a global tax table or specified explicitly.
             },
           ],
           "kind": "content#accountTax", # Identifies what kind of resource this is. Value: the fixed string "content#accountTax".
-          "accountId": "A String", # The ID of the account to which these account tax settings belong.
+          "accountId": "A String", # Required. The ID of the account to which these account tax settings belong.
         },
         "merchantId": "A String", # The ID of the managing account.
         "accountId": "A String", # The ID of the account for which to get/update account tax settings.
@@ -141,16 +142,16 @@
               "country": "A String", # Country code in which tax is applicable.
               "ratePercent": "A String", # Explicit tax rate in percent, represented as a floating point number without the percentage character. Must not be negative.
               "shippingTaxed": True or False, # If true, shipping charges are also taxed.
-              "locationId": "A String", # State (or province) is which the tax is applicable, described by its location ID (also called criteria ID).
+              "locationId": "A String", # Required. State (or province) is which the tax is applicable, described by its location ID (also called criteria ID).
               "useGlobalRate": True or False, # Whether the tax rate is taken from a global tax table or specified explicitly.
             },
           ],
           "kind": "content#accountTax", # Identifies what kind of resource this is. Value: the fixed string "content#accountTax".
-          "accountId": "A String", # The ID of the account to which these account tax settings belong.
+          "accountId": "A String", # Required. The ID of the account to which these account tax settings belong.
         },
         "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.
@@ -159,7 +160,7 @@
             },
           ],
         },
-        "kind": "content#accounttaxCustomBatchResponseEntry", # Identifies what kind of resource this is. Value: the fixed string "content#accounttaxCustomBatchResponseEntry".
+        "kind": "content#accounttaxCustomBatchResponseEntry", # Identifies what kind of resource this is. Value: the fixed string "`content#accounttaxCustomBatchResponseEntry`"
       },
     ],
   }</pre>
@@ -170,7 +171,7 @@
   <pre>Retrieves the tax settings of the account.
 
 Args:
-  merchantId: string, The ID of the managing account. If this parameter is not the same as accountId, then this account must be a multi-client account and accountId must be the ID of a sub-account of this account. (required)
+  merchantId: string, The ID of the managing account. If this parameter is not the same as accountId, then this account must be a multi-client account and `accountId` must be the ID of a sub-account of this account. (required)
   accountId: string, The ID of the account for which to get/update account tax settings. (required)
 
 Returns:
@@ -182,12 +183,12 @@
         "country": "A String", # Country code in which tax is applicable.
         "ratePercent": "A String", # Explicit tax rate in percent, represented as a floating point number without the percentage character. Must not be negative.
         "shippingTaxed": True or False, # If true, shipping charges are also taxed.
-        "locationId": "A String", # State (or province) is which the tax is applicable, described by its location ID (also called criteria ID).
+        "locationId": "A String", # Required. State (or province) is which the tax is applicable, described by its location ID (also called criteria ID).
         "useGlobalRate": True or False, # Whether the tax rate is taken from a global tax table or specified explicitly.
       },
     ],
     "kind": "content#accountTax", # Identifies what kind of resource this is. Value: the fixed string "content#accountTax".
-    "accountId": "A String", # The ID of the account to which these account tax settings belong.
+    "accountId": "A String", # Required. The ID of the account to which these account tax settings belong.
   }</pre>
 </div>
 
@@ -213,12 +214,12 @@
             "country": "A String", # Country code in which tax is applicable.
             "ratePercent": "A String", # Explicit tax rate in percent, represented as a floating point number without the percentage character. Must not be negative.
             "shippingTaxed": True or False, # If true, shipping charges are also taxed.
-            "locationId": "A String", # State (or province) is which the tax is applicable, described by its location ID (also called criteria ID).
+            "locationId": "A String", # Required. State (or province) is which the tax is applicable, described by its location ID (also called criteria ID).
             "useGlobalRate": True or False, # Whether the tax rate is taken from a global tax table or specified explicitly.
           },
         ],
         "kind": "content#accountTax", # Identifies what kind of resource this is. Value: the fixed string "content#accountTax".
-        "accountId": "A String", # The ID of the account to which these account tax settings belong.
+        "accountId": "A String", # Required. The ID of the account to which these account tax settings belong.
       },
     ],
   }</pre>
@@ -239,57 +240,13 @@
 </div>
 
 <div class="method">
-    <code class="details" id="patch">patch(merchantId, accountId, body, dryRun=None)</code>
-  <pre>Updates the tax settings of the account. This method supports patch semantics.
-
-Args:
-  merchantId: string, The ID of the managing account. If this parameter is not the same as accountId, then this account must be a multi-client account and accountId must be the ID of a sub-account of this account. (required)
-  accountId: string, The ID of the account for which to get/update account tax settings. (required)
-  body: object, The request body. (required)
-    The object takes the form of:
-
-{ # The tax settings of a merchant account. All methods require the admin role.
-  "rules": [ # Tax rules. Updating the tax rules will enable US taxes (not reversible). Defining no rules is equivalent to not charging tax at all.
-    { # Tax calculation rule to apply in a state or province (USA only).
-      "country": "A String", # Country code in which tax is applicable.
-      "ratePercent": "A String", # Explicit tax rate in percent, represented as a floating point number without the percentage character. Must not be negative.
-      "shippingTaxed": True or False, # If true, shipping charges are also taxed.
-      "locationId": "A String", # State (or province) is which the tax is applicable, described by its location ID (also called criteria ID).
-      "useGlobalRate": True or False, # Whether the tax rate is taken from a global tax table or specified explicitly.
-    },
-  ],
-  "kind": "content#accountTax", # Identifies what kind of resource this is. Value: the fixed string "content#accountTax".
-  "accountId": "A String", # The ID of the account to which these account tax settings belong.
-}
-
-  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).
-
-Returns:
-  An object of the form:
-
-    { # The tax settings of a merchant account. All methods require the admin role.
-    "rules": [ # Tax rules. Updating the tax rules will enable US taxes (not reversible). Defining no rules is equivalent to not charging tax at all.
-      { # Tax calculation rule to apply in a state or province (USA only).
-        "country": "A String", # Country code in which tax is applicable.
-        "ratePercent": "A String", # Explicit tax rate in percent, represented as a floating point number without the percentage character. Must not be negative.
-        "shippingTaxed": True or False, # If true, shipping charges are also taxed.
-        "locationId": "A String", # State (or province) is which the tax is applicable, described by its location ID (also called criteria ID).
-        "useGlobalRate": True or False, # Whether the tax rate is taken from a global tax table or specified explicitly.
-      },
-    ],
-    "kind": "content#accountTax", # Identifies what kind of resource this is. Value: the fixed string "content#accountTax".
-    "accountId": "A String", # The ID of the account to which these account tax settings belong.
-  }</pre>
-</div>
-
-<div class="method">
-    <code class="details" id="update">update(merchantId, accountId, body, dryRun=None)</code>
+    <code class="details" id="update">update(merchantId, accountId, body=None, dryRun=None)</code>
   <pre>Updates the tax settings of the account.
 
 Args:
-  merchantId: string, The ID of the managing account. If this parameter is not the same as accountId, then this account must be a multi-client account and accountId must be the ID of a sub-account of this account. (required)
+  merchantId: string, The ID of the managing account. If this parameter is not the same as accountId, then this account must be a multi-client account and `accountId` must be the ID of a sub-account of this account. (required)
   accountId: string, The ID of the account for which to get/update account tax settings. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # The tax settings of a merchant account. All methods require the admin role.
@@ -298,12 +255,12 @@
       "country": "A String", # Country code in which tax is applicable.
       "ratePercent": "A String", # Explicit tax rate in percent, represented as a floating point number without the percentage character. Must not be negative.
       "shippingTaxed": True or False, # If true, shipping charges are also taxed.
-      "locationId": "A String", # State (or province) is which the tax is applicable, described by its location ID (also called criteria ID).
+      "locationId": "A String", # Required. State (or province) is which the tax is applicable, described by its location ID (also called criteria ID).
       "useGlobalRate": True or False, # Whether the tax rate is taken from a global tax table or specified explicitly.
     },
   ],
   "kind": "content#accountTax", # Identifies what kind of resource this is. Value: the fixed string "content#accountTax".
-  "accountId": "A String", # The ID of the account to which these account tax settings belong.
+  "accountId": "A String", # Required. The ID of the account to which these account tax settings belong.
 }
 
   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).
@@ -317,12 +274,12 @@
         "country": "A String", # Country code in which tax is applicable.
         "ratePercent": "A String", # Explicit tax rate in percent, represented as a floating point number without the percentage character. Must not be negative.
         "shippingTaxed": True or False, # If true, shipping charges are also taxed.
-        "locationId": "A String", # State (or province) is which the tax is applicable, described by its location ID (also called criteria ID).
+        "locationId": "A String", # Required. State (or province) is which the tax is applicable, described by its location ID (also called criteria ID).
         "useGlobalRate": True or False, # Whether the tax rate is taken from a global tax table or specified explicitly.
       },
     ],
     "kind": "content#accountTax", # Identifies what kind of resource this is. Value: the fixed string "content#accountTax".
-    "accountId": "A String", # The ID of the account to which these account tax settings belong.
+    "accountId": "A String", # Required. The ID of the account to which these account tax settings belong.
   }</pre>
 </div>