Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+</style>
+
+<h1><a href="cloudiot_v1.html">Cloud IoT API</a> . <a href="cloudiot_v1.projects.html">projects</a> . <a href="cloudiot_v1.projects.locations.html">locations</a> . <a href="cloudiot_v1.projects.locations.registries.html">registries</a> . <a href="cloudiot_v1.projects.locations.registries.devices.html">devices</a> . <a href="cloudiot_v1.projects.locations.registries.devices.configVersions.html">configVersions</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#list">list(name, numVersions=None, x__xgafv=None)</a></code></p>
+<p class="firstline">Lists the last few versions of the device configuration in descending</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="list">list(name, numVersions=None, x__xgafv=None)</code>
+  <pre>Lists the last few versions of the device configuration in descending
+order (i.e.: newest first).
+
+Args:
+  name: string, The name of the device. For example,
+`projects/p0/locations/us-central1/registries/registry0/devices/device0` or
+`projects/p0/locations/us-central1/registries/registry0/devices/{num_id}`. (required)
+  numVersions: integer, The number of versions to list. Versions are listed in decreasing order of
+the version number. The maximum number of versions retained is 10. If this
+value is zero, it will return all the versions available.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Response for `ListDeviceConfigVersions`.
+    "deviceConfigs": [ # The device configuration for the last few versions. Versions are listed
+        # in decreasing order, starting from the most recent one.
+      { # The device configuration. Eventually delivered to devices.
+        "version": "A String", # [Output only] The version of this update. The version number is assigned by
+            # the server, and is always greater than 0 after device creation. The
+            # version must be 0 on the `CreateDevice` request if a `config` is
+            # specified; the response of `CreateDevice` will always have a value of 1.
+        "cloudUpdateTime": "A String", # [Output only] The time at which this configuration version was updated in
+            # Cloud IoT Core. This timestamp is set by the server.
+        "binaryData": "A String", # The device configuration data.
+        "deviceAckTime": "A String", # [Output only] The time at which Cloud IoT Core received the
+            # acknowledgment from the device, indicating that the device has received
+            # this configuration version. If this field is not present, the device has
+            # not yet acknowledged that it received this version. Note that when
+            # the config was sent to the device, many config versions may have been
+            # available in Cloud IoT Core while the device was disconnected, and on
+            # connection, only the latest version is sent to the device. Some
+            # versions may never be sent to the device, and therefore are never
+            # acknowledged. This timestamp is set by Cloud IoT Core.
+      },
+    ],
+  }</pre>
+</div>
+
+</body></html>
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