Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+<style>
+
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+  border: 0;
+  font-weight: inherit;
+  font-style: inherit;
+  font-size: 100%;
+  font-family: inherit;
+  vertical-align: baseline;
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+  font-size: 13px;
+  padding: 1em;
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+pre, code {
+  line-height: 1.5;
+  font-family: Monaco, 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Lucida Console', monospace;
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+  font-family: Arial, sans serif;
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+  border-bottom: solid #CCC 1px;
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+.toc_element {
+  margin-top: 0.5em;
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+.firstline {
+  margin-left: 2 em;
+}
+
+.method  {
+  margin-top: 1em;
+  border: solid 1px #CCC;
+  padding: 1em;
+  background: #EEE;
+}
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+.details {
+  font-weight: bold;
+  font-size: 14px;
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+</style>
+
+<h1><a href="healthcare_v1beta1.html">Cloud Healthcare API</a> . <a href="healthcare_v1beta1.projects.html">projects</a> . <a href="healthcare_v1beta1.projects.locations.html">locations</a> . <a href="healthcare_v1beta1.projects.locations.datasets.html">datasets</a> . <a href="healthcare_v1beta1.projects.locations.datasets.dicomStores.html">dicomStores</a> . <a href="healthcare_v1beta1.projects.locations.datasets.dicomStores.studies.html">studies</a> . <a href="healthcare_v1beta1.projects.locations.datasets.dicomStores.studies.series.html">series</a> . <a href="healthcare_v1beta1.projects.locations.datasets.dicomStores.studies.series.instances.html">instances</a> . <a href="healthcare_v1beta1.projects.locations.datasets.dicomStores.studies.series.instances.frames.html">frames</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#retrieveFrames">retrieveFrames(parent, dicomWebPath, x__xgafv=None)</a></code></p>
+<p class="firstline">RetrieveFrames returns instances associated with the given study, series,</p>
+<p class="toc_element">
+  <code><a href="#retrieveRendered">retrieveRendered(parent, dicomWebPath, x__xgafv=None)</a></code></p>
+<p class="firstline">RetrieveRenderedFrames returns instances associated with the given study,</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="retrieveFrames">retrieveFrames(parent, dicomWebPath, x__xgafv=None)</code>
+  <pre>RetrieveFrames returns instances associated with the given study, series,
+SOP Instance UID and frame numbers. See
+http://dicom.nema.org/medical/dicom/current/output/html/part18.html#sect_10.4.
+
+Args:
+  parent: string, The name of the DICOM store that is being accessed (e.g.,
+`projects/{project_id}/locations/{location_id}/datasets/{dataset_id}/dicomStores/{dicom_store_id}`). (required)
+  dicomWebPath: string, The path of the RetrieveFrames DICOMweb request (e.g.,
+`studies/{study_id}/series/{series_id}/instances/{instance_id}/frames/{frame_list}`). (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Message that represents an arbitrary HTTP body. It should only be used for
+        # payload formats that can't be represented as JSON, such as raw binary or
+        # an HTML page.
+        #
+        #
+        # This message can be used both in streaming and non-streaming API methods in
+        # the request as well as the response.
+        #
+        # It can be used as a top-level request field, which is convenient if one
+        # wants to extract parameters from either the URL or HTTP template into the
+        # request fields and also want access to the raw HTTP body.
+        #
+        # Example:
+        #
+        #     message GetResourceRequest {
+        #       // A unique request id.
+        #       string request_id = 1;
+        #
+        #       // The raw HTTP body is bound to this field.
+        #       google.api.HttpBody http_body = 2;
+        #     }
+        #
+        #     service ResourceService {
+        #       rpc GetResource(GetResourceRequest) returns (google.api.HttpBody);
+        #       rpc UpdateResource(google.api.HttpBody) returns
+        #       (google.protobuf.Empty);
+        #     }
+        #
+        # Example with streaming methods:
+        #
+        #     service CaldavService {
+        #       rpc GetCalendar(stream google.api.HttpBody)
+        #         returns (stream google.api.HttpBody);
+        #       rpc UpdateCalendar(stream google.api.HttpBody)
+        #         returns (stream google.api.HttpBody);
+        #     }
+        #
+        # Use of this type only changes how the request and response bodies are
+        # handled, all other features will continue to work unchanged.
+      "contentType": "A String", # The HTTP Content-Type header value specifying the content type of the body.
+      "data": "A String", # The HTTP request/response body as raw binary.
+      "extensions": [ # Application specific response metadata. Must be set in the first response
+          # for streaming APIs.
+        {
+          "a_key": "", # Properties of the object. Contains field @type with type URL.
+        },
+      ],
+    }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="retrieveRendered">retrieveRendered(parent, dicomWebPath, x__xgafv=None)</code>
+  <pre>RetrieveRenderedFrames returns instances associated with the given study,
+series, SOP Instance UID and frame numbers in an acceptable Rendered Media
+Type. See
+http://dicom.nema.org/medical/dicom/current/output/html/part18.html#sect_10.4.
+
+Args:
+  parent: string, The name of the DICOM store that is being accessed (e.g.,
+`projects/{project_id}/locations/{location_id}/datasets/{dataset_id}/dicomStores/{dicom_store_id}`). (required)
+  dicomWebPath: string, The path of the RetrieveRenderedFrames DICOMweb request (e.g.,
+`studies/{study_id}/series/{series_id}/instances/{instance_id}/frames/{frame_list}/rendered`). (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Message that represents an arbitrary HTTP body. It should only be used for
+        # payload formats that can't be represented as JSON, such as raw binary or
+        # an HTML page.
+        #
+        #
+        # This message can be used both in streaming and non-streaming API methods in
+        # the request as well as the response.
+        #
+        # It can be used as a top-level request field, which is convenient if one
+        # wants to extract parameters from either the URL or HTTP template into the
+        # request fields and also want access to the raw HTTP body.
+        #
+        # Example:
+        #
+        #     message GetResourceRequest {
+        #       // A unique request id.
+        #       string request_id = 1;
+        #
+        #       // The raw HTTP body is bound to this field.
+        #       google.api.HttpBody http_body = 2;
+        #     }
+        #
+        #     service ResourceService {
+        #       rpc GetResource(GetResourceRequest) returns (google.api.HttpBody);
+        #       rpc UpdateResource(google.api.HttpBody) returns
+        #       (google.protobuf.Empty);
+        #     }
+        #
+        # Example with streaming methods:
+        #
+        #     service CaldavService {
+        #       rpc GetCalendar(stream google.api.HttpBody)
+        #         returns (stream google.api.HttpBody);
+        #       rpc UpdateCalendar(stream google.api.HttpBody)
+        #         returns (stream google.api.HttpBody);
+        #     }
+        #
+        # Use of this type only changes how the request and response bodies are
+        # handled, all other features will continue to work unchanged.
+      "contentType": "A String", # The HTTP Content-Type header value specifying the content type of the body.
+      "data": "A String", # The HTTP request/response body as raw binary.
+      "extensions": [ # Application specific response metadata. Must be set in the first response
+          # for streaming APIs.
+        {
+          "a_key": "", # Properties of the object. Contains field @type with type URL.
+        },
+      ],
+    }</pre>
+</div>
+
+</body></html>
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