chore: regens API reference docs (#889)

diff --git a/docs/dyn/language_v1beta1.documents.html b/docs/dyn/language_v1beta1.documents.html
index b49d4d4..4939c3b 100644
--- a/docs/dyn/language_v1beta1.documents.html
+++ b/docs/dyn/language_v1beta1.documents.html
@@ -75,26 +75,26 @@
 <h1><a href="language_v1beta1.html">Cloud Natural Language API</a> . <a href="language_v1beta1.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="#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>
 <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.
@@ -108,12 +108,12 @@
           # 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.
@@ -134,12 +134,6 @@
       { # Represents a phrase in the text that is a known entity, such as
           # a person, an organization, or location. The API associates information, such
           # as salience and mentions, with entities.
-        "salience": 3.14, # The salience score associated with the entity in the [0, 1.0] range.
-            #
-            # The salience score for an entity provides information about the
-            # importance or centrality of that entity to the entire document text.
-            # Scores closer to 0 are less salient, while scores closer to 1.0 are highly
-            # salient.
         "mentions": [ # The mentions of this entity in the input document. The API currently
             # supports proper noun mentions.
           { # Represents a mention for an entity in the text. Currently, proper noun
@@ -152,6 +146,12 @@
             "type": "A String", # The type of the entity mention.
           },
         ],
+        "salience": 3.14, # The salience score associated with the entity in the [0, 1.0] range.
+            #
+            # The salience score for an entity provides information about the
+            # importance or centrality of that entity to the entire document text.
+            # Scores closer to 0 are less salient, while scores closer to 1.0 are highly
+            # salient.
         "type": "A String", # The entity type.
         "name": "A String", # The representative name for the entity.
         "metadata": { # Metadata associated with the entity.
@@ -169,11 +169,11 @@
 </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.
@@ -188,12 +188,12 @@
           # 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.
@@ -250,13 +250,13 @@
 </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.
@@ -270,12 +270,12 @@
           # 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.
@@ -299,20 +299,6 @@
           "beginOffset": 42, # The API calculates the beginning offset of the content in the original
               # document according to the EncodingType specified in the API request.
         },
-        "partOfSpeech": { # Represents part of speech information for a token. # Parts of speech tag for this token.
-          "case": "A String", # The grammatical case.
-          "aspect": "A String", # The grammatical aspect.
-          "form": "A String", # The grammatical form.
-          "gender": "A String", # The grammatical gender.
-          "number": "A String", # The grammatical number.
-          "person": "A String", # The grammatical person.
-          "tag": "A String", # The part of speech tag.
-          "tense": "A String", # The grammatical tense.
-          "reciprocity": "A String", # The grammatical reciprocity.
-          "proper": "A String", # The grammatical properness.
-          "voice": "A String", # The grammatical voice.
-          "mood": "A String", # The grammatical mood.
-        },
         "dependencyEdge": { # Represents dependency parse tree information for a token. # Dependency tree parse for this token.
           "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.
@@ -321,6 +307,20 @@
               # `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 tag for this token.
+          "case": "A String", # The grammatical case.
+          "reciprocity": "A String", # The grammatical reciprocity.
+          "mood": "A String", # The grammatical mood.
+          "form": "A String", # The grammatical form.
+          "gender": "A String", # The grammatical gender.
+          "number": "A String", # The grammatical number.
+          "person": "A String", # The grammatical person.
+          "tag": "A String", # The part of speech tag.
+          "tense": "A String", # The grammatical tense.
+          "aspect": "A String", # The grammatical aspect.
+          "proper": "A String", # The grammatical properness.
+          "voice": "A String", # The grammatical voice.
+        },
         "lemma": "A String", # [Lemma](https://en.wikipedia.org/wiki/Lemma_%28morphology%29) of the token.
       },
     ],
@@ -353,23 +353,17 @@
 </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.
-      "extractDocumentSentiment": True or False, # Extract document-level sentiment.
-      "extractEntities": True or False, # Extract entities.
-      "extractSyntax": True or False, # Extract syntax information.
-    },
     "document": { # ################################################################ # # Input document.
         #
         # Represents the input to API methods.
@@ -379,17 +373,23 @@
           # 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. # The enabled features.
+        # Setting each one to true will enable that specific analysis for the input.
+      "extractDocumentSentiment": True or False, # Extract document-level sentiment.
+      "extractEntities": True or False, # Extract entities.
+      "extractSyntax": True or False, # Extract syntax information.
+    },
   }
 
   x__xgafv: string, V1 error format.
@@ -410,20 +410,6 @@
           "beginOffset": 42, # The API calculates the beginning offset of the content in the original
               # document according to the EncodingType specified in the API request.
         },
-        "partOfSpeech": { # Represents part of speech information for a token. # Parts of speech tag for this token.
-          "case": "A String", # The grammatical case.
-          "aspect": "A String", # The grammatical aspect.
-          "form": "A String", # The grammatical form.
-          "gender": "A String", # The grammatical gender.
-          "number": "A String", # The grammatical number.
-          "person": "A String", # The grammatical person.
-          "tag": "A String", # The part of speech tag.
-          "tense": "A String", # The grammatical tense.
-          "reciprocity": "A String", # The grammatical reciprocity.
-          "proper": "A String", # The grammatical properness.
-          "voice": "A String", # The grammatical voice.
-          "mood": "A String", # The grammatical mood.
-        },
         "dependencyEdge": { # Represents dependency parse tree information for a token. # Dependency tree parse for this token.
           "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.
@@ -432,6 +418,20 @@
               # `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 tag for this token.
+          "case": "A String", # The grammatical case.
+          "reciprocity": "A String", # The grammatical reciprocity.
+          "mood": "A String", # The grammatical mood.
+          "form": "A String", # The grammatical form.
+          "gender": "A String", # The grammatical gender.
+          "number": "A String", # The grammatical number.
+          "person": "A String", # The grammatical person.
+          "tag": "A String", # The part of speech tag.
+          "tense": "A String", # The grammatical tense.
+          "aspect": "A String", # The grammatical aspect.
+          "proper": "A String", # The grammatical properness.
+          "voice": "A String", # The grammatical voice.
+        },
         "lemma": "A String", # [Lemma](https://en.wikipedia.org/wiki/Lemma_%28morphology%29) of the token.
       },
     ],
@@ -441,12 +441,6 @@
       { # Represents a phrase in the text that is a known entity, such as
           # a person, an organization, or location. The API associates information, such
           # as salience and mentions, with entities.
-        "salience": 3.14, # The salience score associated with the entity in the [0, 1.0] range.
-            #
-            # The salience score for an entity provides information about the
-            # importance or centrality of that entity to the entire document text.
-            # Scores closer to 0 are less salient, while scores closer to 1.0 are highly
-            # salient.
         "mentions": [ # The mentions of this entity in the input document. The API currently
             # supports proper noun mentions.
           { # Represents a mention for an entity in the text. Currently, proper noun
@@ -459,6 +453,12 @@
             "type": "A String", # The type of the entity mention.
           },
         ],
+        "salience": 3.14, # The salience score associated with the entity in the [0, 1.0] range.
+            #
+            # The salience score for an entity provides information about the
+            # importance or centrality of that entity to the entire document text.
+            # Scores closer to 0 are less salient, while scores closer to 1.0 are highly
+            # salient.
         "type": "A String", # The entity type.
         "name": "A String", # The representative name for the entity.
         "metadata": { # Metadata associated with the entity.