Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+
+<h1><a href="indexing_v3.html">Indexing API</a> . <a href="indexing_v3.urlNotifications.html">urlNotifications</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#getMetadata">getMetadata(url=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Gets metadata about a Web Document. This method can _only_ be used to query</p>
+<p class="toc_element">
+  <code><a href="#publish">publish(body, x__xgafv=None)</a></code></p>
+<p class="firstline">Notifies that a URL has been updated or deleted.</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="getMetadata">getMetadata(url=None, x__xgafv=None)</code>
+  <pre>Gets metadata about a Web Document. This method can _only_ be used to query
+URLs that were previously seen in successful Indexing API notifications.
+Includes the latest `UrlNotification` received via this API.
+
+Args:
+  url: string, URL that is being queried.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Summary of the most recent Indexing API notifications successfully received,
+      # for a given URL.
+    "url": "A String", # URL to which this metadata refers.
+    "latestRemove": { # `UrlNotification` is the resource used in all Indexing API calls. # Latest notification received with type `URL_REMOVED`.
+        # It describes one event in the life cycle of a Web Document.
+      "url": "A String", # The object of this notification. The URL must be owned by the publisher
+          # of this notification and, in case of `URL_UPDATED` notifications, it _must_
+          # be crawlable by Google.
+      "notifyTime": "A String", # Creation timestamp for this notification.
+          # Users should _not_ specify it, the field is ignored at the request time.
+      "type": "A String", # The URL life cycle event that Google is being notified about.
+    },
+    "latestUpdate": { # `UrlNotification` is the resource used in all Indexing API calls. # Latest notification received with type `URL_UPDATED`.
+        # It describes one event in the life cycle of a Web Document.
+      "url": "A String", # The object of this notification. The URL must be owned by the publisher
+          # of this notification and, in case of `URL_UPDATED` notifications, it _must_
+          # be crawlable by Google.
+      "notifyTime": "A String", # Creation timestamp for this notification.
+          # Users should _not_ specify it, the field is ignored at the request time.
+      "type": "A String", # The URL life cycle event that Google is being notified about.
+    },
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="publish">publish(body, x__xgafv=None)</code>
+  <pre>Notifies that a URL has been updated or deleted.
+
+Args:
+  body: object, The request body. (required)
+    The object takes the form of:
+
+{ # `UrlNotification` is the resource used in all Indexing API calls.
+    # It describes one event in the life cycle of a Web Document.
+  "url": "A String", # The object of this notification. The URL must be owned by the publisher
+      # of this notification and, in case of `URL_UPDATED` notifications, it _must_
+      # be crawlable by Google.
+  "notifyTime": "A String", # Creation timestamp for this notification.
+      # Users should _not_ specify it, the field is ignored at the request time.
+  "type": "A String", # The URL life cycle event that Google is being notified about.
+}
+
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Output for PublishUrlNotification
+    "urlNotificationMetadata": { # Summary of the most recent Indexing API notifications successfully received, # Description of the notification events received for this URL.
+        # for a given URL.
+      "url": "A String", # URL to which this metadata refers.
+      "latestRemove": { # `UrlNotification` is the resource used in all Indexing API calls. # Latest notification received with type `URL_REMOVED`.
+          # It describes one event in the life cycle of a Web Document.
+        "url": "A String", # The object of this notification. The URL must be owned by the publisher
+            # of this notification and, in case of `URL_UPDATED` notifications, it _must_
+            # be crawlable by Google.
+        "notifyTime": "A String", # Creation timestamp for this notification.
+            # Users should _not_ specify it, the field is ignored at the request time.
+        "type": "A String", # The URL life cycle event that Google is being notified about.
+      },
+      "latestUpdate": { # `UrlNotification` is the resource used in all Indexing API calls. # Latest notification received with type `URL_UPDATED`.
+          # It describes one event in the life cycle of a Web Document.
+        "url": "A String", # The object of this notification. The URL must be owned by the publisher
+            # of this notification and, in case of `URL_UPDATED` notifications, it _must_
+            # be crawlable by Google.
+        "notifyTime": "A String", # Creation timestamp for this notification.
+            # Users should _not_ specify it, the field is ignored at the request time.
+        "type": "A String", # The URL life cycle event that Google is being notified about.
+      },
+    },
+  }</pre>
+</div>
+
+</body></html>
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