chore: regens API reference docs (#889)

diff --git a/docs/dyn/language_v1.documents.html b/docs/dyn/language_v1.documents.html
index 9d74573..a43da71 100644
--- a/docs/dyn/language_v1.documents.html
+++ b/docs/dyn/language_v1.documents.html
@@ -75,37 +75,37 @@
 <h1><a href="language_v1.html">Cloud Natural Language API</a> . <a href="language_v1.documents.html">documents</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#analyzeEntities">analyzeEntities(body, x__xgafv=None)</a></code></p>
+  <code><a href="#analyzeEntities">analyzeEntities(body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Finds named entities (currently proper names and common nouns) in the text</p>
 <p class="toc_element">
-  <code><a href="#analyzeEntitySentiment">analyzeEntitySentiment(body, x__xgafv=None)</a></code></p>
+  <code><a href="#analyzeEntitySentiment">analyzeEntitySentiment(body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Finds entities, similar to AnalyzeEntities in the text and analyzes</p>
 <p class="toc_element">
-  <code><a href="#analyzeSentiment">analyzeSentiment(body, x__xgafv=None)</a></code></p>
+  <code><a href="#analyzeSentiment">analyzeSentiment(body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Analyzes the sentiment of the provided text.</p>
 <p class="toc_element">
-  <code><a href="#analyzeSyntax">analyzeSyntax(body, x__xgafv=None)</a></code></p>
+  <code><a href="#analyzeSyntax">analyzeSyntax(body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Analyzes the syntax of the text and provides sentence boundaries and</p>
 <p class="toc_element">
-  <code><a href="#annotateText">annotateText(body, x__xgafv=None)</a></code></p>
+  <code><a href="#annotateText">annotateText(body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">A convenience method that provides all the features that analyzeSentiment,</p>
 <p class="toc_element">
-  <code><a href="#classifyText">classifyText(body, x__xgafv=None)</a></code></p>
+  <code><a href="#classifyText">classifyText(body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Classifies a document into categories.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="analyzeEntities">analyzeEntities(body, x__xgafv=None)</code>
+    <code class="details" id="analyzeEntities">analyzeEntities(body=None, x__xgafv=None)</code>
   <pre>Finds named entities (currently proper names and common nouns) in the text
 along with entity types, salience, mentions for each entity, and
 other properties.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # The entity analysis request message.
     "encodingType": "A String", # The encoding type used by the API to calculate offsets.
-    "document": { # ################################################################ # # Input document.
+    "document": { # ################################################################ # # Required. Input document.
         #
         # Represents the input to API methods.
       "content": "A String", # The content of the input in string format.
@@ -114,12 +114,12 @@
           # returns an `INVALID_ARGUMENT` error.
       "language": "A String", # The language of the document (if not specified, the language is
           # automatically detected). Both ISO and BCP-47 language codes are
-          # accepted.<br>
-          # [Language Support](/natural-language/docs/languages)
-          # lists currently supported languages for each API method.
-          # If the language (either specified by the caller or automatically detected)
-          # is not supported by the called API method, an `INVALID_ARGUMENT` error
-          # is returned.
+          # accepted.&lt;br&gt;
+          # [Language
+          # Support](https://cloud.google.com/natural-language/docs/languages) lists
+          # currently supported languages for each API method. If the language (either
+          # specified by the caller or automatically detected) is not supported by the
+          # called API method, an `INVALID_ARGUMENT` error is returned.
       "gcsContentUri": "A String", # The Google Cloud Storage URI where the file content is located.
           # This URI must be of the form: gs://bucket_name/object_name. For more
           # details, see https://cloud.google.com/storage/docs/reference-uris.
@@ -198,17 +198,17 @@
 </div>
 
 <div class="method">
-    <code class="details" id="analyzeEntitySentiment">analyzeEntitySentiment(body, x__xgafv=None)</code>
+    <code class="details" id="analyzeEntitySentiment">analyzeEntitySentiment(body=None, x__xgafv=None)</code>
   <pre>Finds entities, similar to AnalyzeEntities in the text and analyzes
 sentiment associated with each entity and its mentions.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # The entity-level sentiment analysis request message.
     "encodingType": "A String", # The encoding type used by the API to calculate offsets.
-    "document": { # ################################################################ # # Input document.
+    "document": { # ################################################################ # # Required. Input document.
         #
         # Represents the input to API methods.
       "content": "A String", # The content of the input in string format.
@@ -217,12 +217,12 @@
           # returns an `INVALID_ARGUMENT` error.
       "language": "A String", # The language of the document (if not specified, the language is
           # automatically detected). Both ISO and BCP-47 language codes are
-          # accepted.<br>
-          # [Language Support](/natural-language/docs/languages)
-          # lists currently supported languages for each API method.
-          # If the language (either specified by the caller or automatically detected)
-          # is not supported by the called API method, an `INVALID_ARGUMENT` error
-          # is returned.
+          # accepted.&lt;br&gt;
+          # [Language
+          # Support](https://cloud.google.com/natural-language/docs/languages) lists
+          # currently supported languages for each API method. If the language (either
+          # specified by the caller or automatically detected) is not supported by the
+          # called API method, an `INVALID_ARGUMENT` error is returned.
       "gcsContentUri": "A String", # The Google Cloud Storage URI where the file content is located.
           # This URI must be of the form: gs://bucket_name/object_name. For more
           # details, see https://cloud.google.com/storage/docs/reference-uris.
@@ -301,15 +301,16 @@
 </div>
 
 <div class="method">
-    <code class="details" id="analyzeSentiment">analyzeSentiment(body, x__xgafv=None)</code>
+    <code class="details" id="analyzeSentiment">analyzeSentiment(body=None, x__xgafv=None)</code>
   <pre>Analyzes the sentiment of the provided text.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # The sentiment analysis request message.
-    "document": { # ################################################################ # # Input document.
+    "encodingType": "A String", # The encoding type used by the API to calculate sentence offsets.
+    "document": { # ################################################################ # # Required. Input document.
         #
         # Represents the input to API methods.
       "content": "A String", # The content of the input in string format.
@@ -318,18 +319,17 @@
           # returns an `INVALID_ARGUMENT` error.
       "language": "A String", # The language of the document (if not specified, the language is
           # automatically detected). Both ISO and BCP-47 language codes are
-          # accepted.<br>
-          # [Language Support](/natural-language/docs/languages)
-          # lists currently supported languages for each API method.
-          # If the language (either specified by the caller or automatically detected)
-          # is not supported by the called API method, an `INVALID_ARGUMENT` error
-          # is returned.
+          # accepted.&lt;br&gt;
+          # [Language
+          # Support](https://cloud.google.com/natural-language/docs/languages) lists
+          # currently supported languages for each API method. If the language (either
+          # specified by the caller or automatically detected) is not supported by the
+          # called API method, an `INVALID_ARGUMENT` error is returned.
       "gcsContentUri": "A String", # The Google Cloud Storage URI where the file content is located.
           # This URI must be of the form: gs://bucket_name/object_name. For more
           # details, see https://cloud.google.com/storage/docs/reference-uris.
           # NOTE: Cloud Storage object versioning is not supported.
     },
-    "encodingType": "A String", # The encoding type used by the API to calculate sentence offsets.
   }
 
   x__xgafv: string, V1 error format.
@@ -375,18 +375,18 @@
 </div>
 
 <div class="method">
-    <code class="details" id="analyzeSyntax">analyzeSyntax(body, x__xgafv=None)</code>
+    <code class="details" id="analyzeSyntax">analyzeSyntax(body=None, x__xgafv=None)</code>
   <pre>Analyzes the syntax of the text and provides sentence boundaries and
 tokenization along with part of speech tags, dependency trees, and other
 properties.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # The syntax analysis request message.
     "encodingType": "A String", # The encoding type used by the API to calculate offsets.
-    "document": { # ################################################################ # # Input document.
+    "document": { # ################################################################ # # Required. Input document.
         #
         # Represents the input to API methods.
       "content": "A String", # The content of the input in string format.
@@ -395,12 +395,12 @@
           # returns an `INVALID_ARGUMENT` error.
       "language": "A String", # The language of the document (if not specified, the language is
           # automatically detected). Both ISO and BCP-47 language codes are
-          # accepted.<br>
-          # [Language Support](/natural-language/docs/languages)
-          # lists currently supported languages for each API method.
-          # If the language (either specified by the caller or automatically detected)
-          # is not supported by the called API method, an `INVALID_ARGUMENT` error
-          # is returned.
+          # accepted.&lt;br&gt;
+          # [Language
+          # Support](https://cloud.google.com/natural-language/docs/languages) lists
+          # currently supported languages for each API method. If the language (either
+          # specified by the caller or automatically detected) is not supported by the
+          # called API method, an `INVALID_ARGUMENT` error is returned.
       "gcsContentUri": "A String", # The Google Cloud Storage URI where the file content is located.
           # This URI must be of the form: gs://bucket_name/object_name. For more
           # details, see https://cloud.google.com/storage/docs/reference-uris.
@@ -424,16 +424,6 @@
           "beginOffset": 42, # The API calculates the beginning offset of the content in the original
               # document according to the EncodingType specified in the API request.
         },
-        "dependencyEdge": { # Represents dependency parse tree information for a token. (For more # Dependency tree parse for this token.
-            # information on dependency labels, see
-            # http://www.aclweb.org/anthology/P13-2017
-          "headTokenIndex": 42, # Represents the head of this token in the dependency tree.
-              # This is the index of the token which has an arc going to this token.
-              # The index is the position of the token in the array of tokens returned
-              # by the API method. If this token is a root token, then the
-              # `head_token_index` is its own index.
-          "label": "A String", # The parse label for the token.
-        },
         "partOfSpeech": { # Represents part of speech information for a token. Parts of speech # Parts of speech tag for this token.
             # are as defined in
             # http://www.lrec-conf.org/proceedings/lrec2012/pdf/274_Paper.pdf
@@ -450,6 +440,16 @@
           "voice": "A String", # The grammatical voice.
           "mood": "A String", # The grammatical mood.
         },
+        "dependencyEdge": { # Represents dependency parse tree information for a token. (For more # Dependency tree parse for this token.
+            # information on dependency labels, see
+            # http://www.aclweb.org/anthology/P13-2017
+          "headTokenIndex": 42, # Represents the head of this token in the dependency tree.
+              # This is the index of the token which has an arc going to this token.
+              # The index is the position of the token in the array of tokens returned
+              # by the API method. If this token is a root token, then the
+              # `head_token_index` is its own index.
+          "label": "A String", # The parse label for the token.
+        },
         "lemma": "A String", # [Lemma](https://en.wikipedia.org/wiki/Lemma_%28morphology%29) of the token.
       },
     ],
@@ -479,26 +479,18 @@
 </div>
 
 <div class="method">
-    <code class="details" id="annotateText">annotateText(body, x__xgafv=None)</code>
+    <code class="details" id="annotateText">annotateText(body=None, x__xgafv=None)</code>
   <pre>A convenience method that provides all the features that analyzeSentiment,
 analyzeEntities, and analyzeSyntax provide in one call.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # The request message for the text annotation API, which can perform multiple
       # analysis types (sentiment, entities, and syntax) in one call.
     "encodingType": "A String", # The encoding type used by the API to calculate offsets.
-    "features": { # All available features for sentiment, syntax, and semantic analysis. # The enabled features.
-        # Setting each one to true will enable that specific analysis for the input.
-      "classifyText": True or False, # Classify the full document into categories.
-      "extractEntitySentiment": True or False, # Extract entities and their associated sentiment.
-      "extractDocumentSentiment": True or False, # Extract document-level sentiment.
-      "extractEntities": True or False, # Extract entities.
-      "extractSyntax": True or False, # Extract syntax information.
-    },
-    "document": { # ################################################################ # # Input document.
+    "document": { # ################################################################ # # Required. Input document.
         #
         # Represents the input to API methods.
       "content": "A String", # The content of the input in string format.
@@ -507,17 +499,25 @@
           # returns an `INVALID_ARGUMENT` error.
       "language": "A String", # The language of the document (if not specified, the language is
           # automatically detected). Both ISO and BCP-47 language codes are
-          # accepted.<br>
-          # [Language Support](/natural-language/docs/languages)
-          # lists currently supported languages for each API method.
-          # If the language (either specified by the caller or automatically detected)
-          # is not supported by the called API method, an `INVALID_ARGUMENT` error
-          # is returned.
+          # accepted.&lt;br&gt;
+          # [Language
+          # Support](https://cloud.google.com/natural-language/docs/languages) lists
+          # currently supported languages for each API method. If the language (either
+          # specified by the caller or automatically detected) is not supported by the
+          # called API method, an `INVALID_ARGUMENT` error is returned.
       "gcsContentUri": "A String", # The Google Cloud Storage URI where the file content is located.
           # This URI must be of the form: gs://bucket_name/object_name. For more
           # details, see https://cloud.google.com/storage/docs/reference-uris.
           # NOTE: Cloud Storage object versioning is not supported.
     },
+    "features": { # All available features for sentiment, syntax, and semantic analysis. # Required. The enabled features.
+        # Setting each one to true will enable that specific analysis for the input.
+      "extractDocumentSentiment": True or False, # Extract document-level sentiment.
+      "extractEntitySentiment": True or False, # Extract entities and their associated sentiment.
+      "extractSyntax": True or False, # Extract syntax information.
+      "extractEntities": True or False, # Extract entities.
+      "classifyText": True or False, # Classify the full document into categories.
+    },
   }
 
   x__xgafv: string, V1 error format.
@@ -541,16 +541,6 @@
           "beginOffset": 42, # The API calculates the beginning offset of the content in the original
               # document according to the EncodingType specified in the API request.
         },
-        "dependencyEdge": { # Represents dependency parse tree information for a token. (For more # Dependency tree parse for this token.
-            # information on dependency labels, see
-            # http://www.aclweb.org/anthology/P13-2017
-          "headTokenIndex": 42, # Represents the head of this token in the dependency tree.
-              # This is the index of the token which has an arc going to this token.
-              # The index is the position of the token in the array of tokens returned
-              # by the API method. If this token is a root token, then the
-              # `head_token_index` is its own index.
-          "label": "A String", # The parse label for the token.
-        },
         "partOfSpeech": { # Represents part of speech information for a token. Parts of speech # Parts of speech tag for this token.
             # are as defined in
             # http://www.lrec-conf.org/proceedings/lrec2012/pdf/274_Paper.pdf
@@ -567,6 +557,16 @@
           "voice": "A String", # The grammatical voice.
           "mood": "A String", # The grammatical mood.
         },
+        "dependencyEdge": { # Represents dependency parse tree information for a token. (For more # Dependency tree parse for this token.
+            # information on dependency labels, see
+            # http://www.aclweb.org/anthology/P13-2017
+          "headTokenIndex": 42, # Represents the head of this token in the dependency tree.
+              # This is the index of the token which has an arc going to this token.
+              # The index is the position of the token in the array of tokens returned
+              # by the API method. If this token is a root token, then the
+              # `head_token_index` is its own index.
+          "label": "A String", # The parse label for the token.
+        },
         "lemma": "A String", # [Lemma](https://en.wikipedia.org/wiki/Lemma_%28morphology%29) of the token.
       },
     ],
@@ -661,22 +661,22 @@
         "confidence": 3.14, # The classifier's confidence of the category. Number represents how certain
             # the classifier is that this category represents the given text.
         "name": "A String", # The name of the category representing the document, from the [predefined
-            # taxonomy](/natural-language/docs/categories).
+            # taxonomy](https://cloud.google.com/natural-language/docs/categories).
       },
     ],
   }</pre>
 </div>
 
 <div class="method">
-    <code class="details" id="classifyText">classifyText(body, x__xgafv=None)</code>
+    <code class="details" id="classifyText">classifyText(body=None, x__xgafv=None)</code>
   <pre>Classifies a document into categories.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # The document classification request message.
-    "document": { # ################################################################ # # Input document.
+    "document": { # ################################################################ # # Required. Input document.
         #
         # Represents the input to API methods.
       "content": "A String", # The content of the input in string format.
@@ -685,12 +685,12 @@
           # returns an `INVALID_ARGUMENT` error.
       "language": "A String", # The language of the document (if not specified, the language is
           # automatically detected). Both ISO and BCP-47 language codes are
-          # accepted.<br>
-          # [Language Support](/natural-language/docs/languages)
-          # lists currently supported languages for each API method.
-          # If the language (either specified by the caller or automatically detected)
-          # is not supported by the called API method, an `INVALID_ARGUMENT` error
-          # is returned.
+          # accepted.&lt;br&gt;
+          # [Language
+          # Support](https://cloud.google.com/natural-language/docs/languages) lists
+          # currently supported languages for each API method. If the language (either
+          # specified by the caller or automatically detected) is not supported by the
+          # called API method, an `INVALID_ARGUMENT` error is returned.
       "gcsContentUri": "A String", # The Google Cloud Storage URI where the file content is located.
           # This URI must be of the form: gs://bucket_name/object_name. For more
           # details, see https://cloud.google.com/storage/docs/reference-uris.
@@ -712,7 +712,7 @@
         "confidence": 3.14, # The classifier's confidence of the category. Number represents how certain
             # the classifier is that this category represents the given text.
         "name": "A String", # The name of the category representing the document, from the [predefined
-            # taxonomy](/natural-language/docs/categories).
+            # taxonomy](https://cloud.google.com/natural-language/docs/categories).
       },
     ],
   }</pre>