chore: regens API reference docs (#889)

diff --git a/docs/dyn/dialogflow_v2beta1.projects.agent.knowledgeBases.html b/docs/dyn/dialogflow_v2beta1.projects.agent.knowledgeBases.html
index 1ef0626..98716b3 100644
--- a/docs/dyn/dialogflow_v2beta1.projects.agent.knowledgeBases.html
+++ b/docs/dyn/dialogflow_v2beta1.projects.agent.knowledgeBases.html
@@ -80,7 +80,7 @@
 <p class="firstline">Returns the documents Resource.</p>
 
 <p class="toc_element">
-  <code><a href="#create">create(parent, body, x__xgafv=None)</a></code></p>
+  <code><a href="#create">create(parent, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Creates a knowledge base.</p>
 <p class="toc_element">
   <code><a href="#delete">delete(name, force=None, x__xgafv=None)</a></code></p>
@@ -95,11 +95,11 @@
   <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(name, body, updateMask=None, x__xgafv=None)</a></code></p>
+  <code><a href="#patch">patch(name, body=None, updateMask=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Updates the specified knowledge base.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="create">create(parent, body, x__xgafv=None)</code>
+    <code class="details" id="create">create(parent, body=None, x__xgafv=None)</code>
   <pre>Creates a knowledge base.
 
 Note: The `projects.agent.knowledgeBases` resource is deprecated;
@@ -107,19 +107,22 @@
 
 Args:
   parent: string, Required. The project to create a knowledge base for.
-Format: `projects/<Project ID>`. (required)
-  body: object, The request body. (required)
+Format: `projects/&lt;Project ID&gt;`. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Represents knowledge base resource.
       # 
       # Note: The `projects.agent.knowledgeBases` resource is deprecated;
       # only use `projects.knowledgeBases`.
+    "languageCode": "A String", # Language which represents the KnowledgeBase. When the KnowledgeBase is
+        # created/updated, this is populated for all non en-us languages. If not
+        # populated, the default language en-us applies.
     "displayName": "A String", # Required. The display name of the knowledge base. The name must be 1024
         # bytes or less; otherwise, the creation request fails.
     "name": "A String", # The knowledge base resource name.
         # The name must be empty when creating a knowledge base.
-        # Format: `projects/<Project ID>/knowledgeBases/<Knowledge Base ID>`.
+        # Format: `projects/&lt;Project ID&gt;/knowledgeBases/&lt;Knowledge Base ID&gt;`.
   }
 
   x__xgafv: string, V1 error format.
@@ -134,11 +137,14 @@
         #
         # Note: The `projects.agent.knowledgeBases` resource is deprecated;
         # only use `projects.knowledgeBases`.
+      "languageCode": "A String", # Language which represents the KnowledgeBase. When the KnowledgeBase is
+          # created/updated, this is populated for all non en-us languages. If not
+          # populated, the default language en-us applies.
       "displayName": "A String", # Required. The display name of the knowledge base. The name must be 1024
           # bytes or less; otherwise, the creation request fails.
       "name": "A String", # The knowledge base resource name.
           # The name must be empty when creating a knowledge base.
-          # Format: `projects/<Project ID>/knowledgeBases/<Knowledge Base ID>`.
+          # Format: `projects/&lt;Project ID&gt;/knowledgeBases/&lt;Knowledge Base ID&gt;`.
     }</pre>
 </div>
 
@@ -151,7 +157,7 @@
 
 Args:
   name: string, Required. The name of the knowledge base to delete.
-Format: `projects/<Project ID>/knowledgeBases/<Knowledge Base ID>`. (required)
+Format: `projects/&lt;Project ID&gt;/knowledgeBases/&lt;Knowledge Base ID&gt;`. (required)
   force: boolean, Optional. Force deletes the knowledge base. When set to true, any documents
 in the knowledge base are also deleted.
   x__xgafv: string, V1 error format.
@@ -183,7 +189,7 @@
 
 Args:
   name: string, Required. The name of the knowledge base to retrieve.
-Format `projects/<Project ID>/knowledgeBases/<Knowledge Base ID>`. (required)
+Format `projects/&lt;Project ID&gt;/knowledgeBases/&lt;Knowledge Base ID&gt;`. (required)
   x__xgafv: string, V1 error format.
     Allowed values
       1 - v1 error format
@@ -196,11 +202,14 @@
         #
         # Note: The `projects.agent.knowledgeBases` resource is deprecated;
         # only use `projects.knowledgeBases`.
+      "languageCode": "A String", # Language which represents the KnowledgeBase. When the KnowledgeBase is
+          # created/updated, this is populated for all non en-us languages. If not
+          # populated, the default language en-us applies.
       "displayName": "A String", # Required. The display name of the knowledge base. The name must be 1024
           # bytes or less; otherwise, the creation request fails.
       "name": "A String", # The knowledge base resource name.
           # The name must be empty when creating a knowledge base.
-          # Format: `projects/<Project ID>/knowledgeBases/<Knowledge Base ID>`.
+          # Format: `projects/&lt;Project ID&gt;/knowledgeBases/&lt;Knowledge Base ID&gt;`.
     }</pre>
 </div>
 
@@ -213,7 +222,7 @@
 
 Args:
   parent: string, Required. The project to list of knowledge bases for.
-Format: `projects/<Project ID>`. (required)
+Format: `projects/&lt;Project ID&gt;`. (required)
   pageSize: integer, Optional. The maximum number of items to return in a single page. By
 default 10 and at most 100.
   pageToken: string, Optional. The next_page_token value returned from a previous list request.
@@ -233,11 +242,14 @@
             #
             # Note: The `projects.agent.knowledgeBases` resource is deprecated;
             # only use `projects.knowledgeBases`.
+          "languageCode": "A String", # Language which represents the KnowledgeBase. When the KnowledgeBase is
+              # created/updated, this is populated for all non en-us languages. If not
+              # populated, the default language en-us applies.
           "displayName": "A String", # Required. The display name of the knowledge base. The name must be 1024
               # bytes or less; otherwise, the creation request fails.
           "name": "A String", # The knowledge base resource name.
               # The name must be empty when creating a knowledge base.
-              # Format: `projects/<Project ID>/knowledgeBases/<Knowledge Base ID>`.
+              # Format: `projects/&lt;Project ID&gt;/knowledgeBases/&lt;Knowledge Base ID&gt;`.
         },
     ],
   }</pre>
@@ -258,7 +270,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="patch">patch(name, body, updateMask=None, x__xgafv=None)</code>
+    <code class="details" id="patch">patch(name, body=None, updateMask=None, x__xgafv=None)</code>
   <pre>Updates the specified knowledge base.
 
 Note: The `projects.agent.knowledgeBases` resource is deprecated;
@@ -267,19 +279,22 @@
 Args:
   name: string, The knowledge base resource name.
 The name must be empty when creating a knowledge base.
-Format: `projects/<Project ID>/knowledgeBases/<Knowledge Base ID>`. (required)
-  body: object, The request body. (required)
+Format: `projects/&lt;Project ID&gt;/knowledgeBases/&lt;Knowledge Base ID&gt;`. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Represents knowledge base resource.
       # 
       # Note: The `projects.agent.knowledgeBases` resource is deprecated;
       # only use `projects.knowledgeBases`.
+    "languageCode": "A String", # Language which represents the KnowledgeBase. When the KnowledgeBase is
+        # created/updated, this is populated for all non en-us languages. If not
+        # populated, the default language en-us applies.
     "displayName": "A String", # Required. The display name of the knowledge base. The name must be 1024
         # bytes or less; otherwise, the creation request fails.
     "name": "A String", # The knowledge base resource name.
         # The name must be empty when creating a knowledge base.
-        # Format: `projects/<Project ID>/knowledgeBases/<Knowledge Base ID>`.
+        # Format: `projects/&lt;Project ID&gt;/knowledgeBases/&lt;Knowledge Base ID&gt;`.
   }
 
   updateMask: string, Optional. Not specified means `update all`.
@@ -297,11 +312,14 @@
         #
         # Note: The `projects.agent.knowledgeBases` resource is deprecated;
         # only use `projects.knowledgeBases`.
+      "languageCode": "A String", # Language which represents the KnowledgeBase. When the KnowledgeBase is
+          # created/updated, this is populated for all non en-us languages. If not
+          # populated, the default language en-us applies.
       "displayName": "A String", # Required. The display name of the knowledge base. The name must be 1024
           # bytes or less; otherwise, the creation request fails.
       "name": "A String", # The knowledge base resource name.
           # The name must be empty when creating a knowledge base.
-          # Format: `projects/<Project ID>/knowledgeBases/<Knowledge Base ID>`.
+          # Format: `projects/&lt;Project ID&gt;/knowledgeBases/&lt;Knowledge Base ID&gt;`.
     }</pre>
 </div>