Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
diff --git a/docs/dyn/content_v2.accounttax.html b/docs/dyn/content_v2.accounttax.html
index 4f4c97d..6601618 100644
--- a/docs/dyn/content_v2.accounttax.html
+++ b/docs/dyn/content_v2.accounttax.html
@@ -79,19 +79,19 @@
 <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>
-<p class="firstline">Retrieves the tax settings of the account. This method can only be called for accounts to which the managing account has access: either the managing account itself or sub-accounts if the managing account is a multi-client account.</p>
+<p class="firstline">Retrieves the tax settings of the account.</p>
 <p class="toc_element">
   <code><a href="#list">list(merchantId, pageToken=None, maxResults=None)</a></code></p>
-<p class="firstline">Lists the tax settings of the sub-accounts in your Merchant Center account. This method can only be called for multi-client accounts.</p>
+<p class="firstline">Lists the tax settings of the sub-accounts in your Merchant Center account.</p>
 <p class="toc_element">
   <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 can only be called for accounts to which the managing account has access: either the managing account itself or sub-accounts if the managing account is a multi-client account. This method supports patch semantics.</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>
-<p class="firstline">Updates the tax settings of the account. This method can only be called for accounts to which the managing account has access: either the managing account itself or sub-accounts if the managing account is a multi-client account.</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>
@@ -106,13 +106,13 @@
       { # 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. # The account tax settings to update. Only defined if the method is 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", # 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.
             },
           ],
@@ -125,7 +125,7 @@
     ],
   }
 
-  dryRun: boolean, Flag to run the request in dry-run mode.
+  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:
@@ -135,13 +135,13 @@
     "entries": [ # The result of the execution of the batch requests.
       { # A batch entry encoding a single non-batch accounttax response.
         "batchId": 42, # The ID of the request entry this entry responds to.
-        "accountTax": { # The tax settings of a merchant account. # The retrieved or updated account tax settings.
+        "accountTax": { # The tax settings of a merchant account. All methods require the admin role. # The retrieved or updated account tax settings.
           "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", # 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.
             },
           ],
@@ -167,22 +167,22 @@
 
 <div class="method">
     <code class="details" id="get">get(merchantId, accountId)</code>
-  <pre>Retrieves the tax settings of the account. This method can only be called for accounts to which the managing account has access: either the managing account itself or sub-accounts if the managing account is a multi-client account.
+  <pre>Retrieves the tax settings of the account.
 
 Args:
-  merchantId: string, The ID of the managing 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:
   An object of the form:
 
-    { # The tax settings of a merchant account.
+    { # 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).
+        "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.
       },
     ],
@@ -193,10 +193,10 @@
 
 <div class="method">
     <code class="details" id="list">list(merchantId, pageToken=None, maxResults=None)</code>
-  <pre>Lists the tax settings of the sub-accounts in your Merchant Center account. This method can only be called for multi-client accounts.
+  <pre>Lists the tax settings of the sub-accounts in your Merchant Center account.
 
 Args:
-  merchantId: string, The ID of the managing account. (required)
+  merchantId: string, The ID of the managing account. This must be a multi-client account. (required)
   pageToken: string, The token returned by the previous request.
   maxResults: integer, The maximum number of tax settings to return in the response, used for paging.
 
@@ -207,13 +207,13 @@
     "nextPageToken": "A String", # The token for the retrieval of the next page of account tax settings.
     "kind": "content#accounttaxListResponse", # Identifies what kind of resource this is. Value: the fixed string "content#accounttaxListResponse".
     "resources": [
-      { # The tax settings of a merchant account.
+      { # 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).
+            "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.
           },
         ],
@@ -240,21 +240,21 @@
 
 <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 can only be called for accounts to which the managing account has access: either the managing account itself or sub-accounts if the managing account is a multi-client account. This method supports patch semantics.
+  <pre>Updates the tax settings of the account. This method supports patch semantics.
 
 Args:
-  merchantId: string, The ID of the managing 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)
     The object takes the form of:
 
-{ # The tax settings of a merchant account.
+{ # 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).
+      "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.
     },
   ],
@@ -262,18 +262,18 @@
   "accountId": "A String", # The ID of the account to which these account tax settings belong.
 }
 
-  dryRun: boolean, Flag to run the request in dry-run mode.
+  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.
+    { # 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).
+        "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.
       },
     ],
@@ -284,21 +284,21 @@
 
 <div class="method">
     <code class="details" id="update">update(merchantId, accountId, body, dryRun=None)</code>
-  <pre>Updates the tax settings of the account. This method can only be called for accounts to which the managing account has access: either the managing account itself or sub-accounts if the managing account is a multi-client account.
+  <pre>Updates the tax settings of the account.
 
 Args:
-  merchantId: string, The ID of the managing 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)
     The object takes the form of:
 
-{ # The tax settings of a merchant account.
+{ # 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).
+      "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.
     },
   ],
@@ -306,18 +306,18 @@
   "accountId": "A String", # The ID of the account to which these account tax settings belong.
 }
 
-  dryRun: boolean, Flag to run the request in dry-run mode.
+  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.
+    { # 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).
+        "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.
       },
     ],