Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+
+<h1><a href="dialogflow_v2.html">Dialogflow API</a> . <a href="dialogflow_v2.projects.html">projects</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="dialogflow_v2.projects.agent.html">agent()</a></code>
+</p>
+<p class="firstline">Returns the agent Resource.</p>
+
+<p class="toc_element">
+  <code><a href="dialogflow_v2.projects.operations.html">operations()</a></code>
+</p>
+<p class="firstline">Returns the operations Resource.</p>
+
+<p class="toc_element">
+  <code><a href="#deleteAgent">deleteAgent(parent, x__xgafv=None)</a></code></p>
+<p class="firstline">Deletes the specified agent.</p>
+<p class="toc_element">
+  <code><a href="#getAgent">getAgent(parent, x__xgafv=None)</a></code></p>
+<p class="firstline">Retrieves the specified agent.</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="deleteAgent">deleteAgent(parent, x__xgafv=None)</code>
+  <pre>Deletes the specified agent.
+
+Args:
+  parent: string, Required. The project that the agent to delete is associated with.
+Format: `projects/<Project ID>`. (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # A generic empty message that you can re-use to avoid defining duplicated
+      # empty messages in your APIs. A typical example is to use it as the request
+      # or the response type of an API method. For instance:
+      #
+      #     service Foo {
+      #       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
+      #     }
+      #
+      # The JSON representation for `Empty` is empty JSON object `{}`.
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="getAgent">getAgent(parent, x__xgafv=None)</code>
+  <pre>Retrieves the specified agent.
+
+Args:
+  parent: string, Required. The project that the agent to fetch is associated with.
+Format: `projects/<Project ID>`. (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Represents a conversational agent.
+      "avatarUri": "A String", # Optional. The URI of the agent's avatar.
+          # Avatars are used throughout the Dialogflow console and in the self-hosted
+          # [Web
+          # Demo](https://cloud.google.com/dialogflow-enterprise/docs/integrations/web-demo)
+          # integration.
+      "displayName": "A String", # Required. The name of this agent.
+      "description": "A String", # Optional. The description of this agent.
+          # The maximum length is 500 characters. If exceeded, the request is rejected.
+      "parent": "A String", # Required. The project of this agent.
+          # Format: `projects/<Project ID>`.
+      "defaultLanguageCode": "A String", # Required. The default language of the agent as a language tag. See
+          # [Language
+          # Support](https://cloud.google.com/dialogflow-enterprise/docs/reference/language)
+          # for a list of the currently supported language codes. This field cannot be
+          # set by the `Update` method.
+      "apiVersion": "A String", # Optional. API version displayed in Dialogflow console. If not specified,
+          # V2 API is assumed. Clients are free to query different service endpoints
+          # for different API versions. However, bots connectors and webhook calls will
+          # follow the specified API version.
+      "enableLogging": True or False, # Optional. Determines whether this agent should log conversation queries.
+      "matchMode": "A String", # Optional. Determines how intents are detected from user queries.
+      "supportedLanguageCodes": [ # Optional. The list of all languages supported by this agent (except for the
+          # `default_language_code`).
+        "A String",
+      ],
+      "tier": "A String", # Optional. The agent tier. If not specified, TIER_STANDARD is assumed.
+      "timeZone": "A String", # Required. The time zone of this agent from the
+          # [time zone database](https://www.iana.org/time-zones), e.g.,
+          # America/New_York, Europe/Paris.
+      "classificationThreshold": 3.14, # Optional. To filter out false positive results and still get variety in
+          # matched natural language inputs for your agent, you can tune the machine
+          # learning classification threshold. If the returned score value is less than
+          # the threshold value, then a fallback intent will be triggered or, if there
+          # are no fallback intents defined, no intent will be triggered. The score
+          # values range from 0.0 (completely uncertain) to 1.0 (completely certain).
+          # If set to 0.0, the default of 0.3 is used.
+    }</pre>
+</div>
+
+</body></html>
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