docs: update generated docs (#981)

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+
+<h1><a href="chat_v1.html">Hangouts Chat API</a> . <a href="chat_v1.spaces.html">spaces</a> . <a href="chat_v1.spaces.messages.html">messages</a> . <a href="chat_v1.spaces.messages.attachments.html">attachments</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#get">get(name, x__xgafv=None)</a></code></p>
+<p class="firstline">Gets the metadata of a message attachment. The attachment data is fetched</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="get">get(name, x__xgafv=None)</code>
+  <pre>Gets the metadata of a message attachment. The attachment data is fetched
+using the media API.
+
+Args:
+  name: string, Resource name of the attachment, in the form
+&quot;spaces/*/messages/*/attachments/*&quot;. (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # An attachment in Hangouts Chat.
+    &quot;thumbnailUri&quot;: &quot;A String&quot;, # Output only. The thumbnail URL which should be used to preview the
+        # attachment to a human user. Bots should not use this URL to download
+        # attachment content.
+    &quot;driveDataRef&quot;: { # A reference to the data of a drive attachment. # A reference to the drive attachment. This is used with the Drive API.
+      &quot;driveFileId&quot;: &quot;A String&quot;, # The id for the drive file, for use with the Drive API.
+    },
+    &quot;downloadUri&quot;: &quot;A String&quot;, # Output only. The download URL which should be used to allow a human user to
+        # download the attachment. Bots should not use this URL to download
+        # attachment content.
+    &quot;contentType&quot;: &quot;A String&quot;, # The content type (MIME type) of the file.
+    &quot;name&quot;: &quot;A String&quot;, # Resource name of the attachment, in the form
+        # &quot;spaces/*/messages/*/attachments/*&quot;.
+    &quot;source&quot;: &quot;A String&quot;, # The source of the attachment.
+    &quot;attachmentDataRef&quot;: { # A reference to the data of an attachment. # A reference to the attachment data. This is used with the media API to
+        # download the attachment data.
+      &quot;resourceName&quot;: &quot;A String&quot;, # The resource name of the attachment data. This is used with the media API
+          # to download the attachment data.
+    },
+    &quot;contentName&quot;: &quot;A String&quot;, # The original file name for the content, not the full path.
+  }</pre>
+</div>
+
+</body></html>
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