Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+
+<h1><a href="remotebuildexecution_v2.html">Remote Build Execution API</a> . <a href="remotebuildexecution_v2.v2.html">v2</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#getCapabilities">getCapabilities(instanceName, x__xgafv=None)</a></code></p>
+<p class="firstline">GetCapabilities returns the server capabilities configuration of the</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="getCapabilities">getCapabilities(instanceName, x__xgafv=None)</code>
+  <pre>GetCapabilities returns the server capabilities configuration of the
+remote endpoint.
+Only the capabilities of the services supported by the endpoint will
+be returned:
+* Execution + CAS + Action Cache endpoints should return both
+  CacheCapabilities and ExecutionCapabilities.
+* Execution only endpoints should return ExecutionCapabilities.
+* CAS + Action Cache only endpoints should return CacheCapabilities.
+
+Args:
+  instanceName: string, The instance of the execution system to operate against. A server may
+support multiple instances of the execution system (with their own workers,
+storage, caches, etc.). The server MAY require use of this field to select
+between them in an implementation-defined fashion, otherwise it can be
+omitted. (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # A response message for
+      # Capabilities.GetCapabilities.
+    "deprecatedApiVersion": { # The full version of a given tool. # Earliest RE API version supported, including deprecated versions.
+      "major": 42, # The major version, e.g 10 for 10.2.3.
+      "prerelease": "A String", # The pre-release version. Either this field or major/minor/patch fields
+          # must be filled. They are mutually exclusive. Pre-release versions are
+          # assumed to be earlier than any released versions.
+      "minor": 42, # The minor version, e.g. 2 for 10.2.3.
+      "patch": 42, # The patch version, e.g 3 for 10.2.3.
+    },
+    "cacheCapabilities": { # Capabilities of the remote cache system. # Capabilities of the remote cache system.
+      "cachePriorityCapabilities": { # Allowed values for priority in # Supported cache priority range for both CAS and ActionCache.
+          # ResultsCachePolicy
+          # Used for querying both cache and execution valid priority ranges.
+        "priorities": [
+          { # Supported range of priorities, including boundaries.
+            "maxPriority": 42,
+            "minPriority": 42,
+          },
+        ],
+      },
+      "maxBatchTotalSizeBytes": "A String", # Maximum total size of blobs to be uploaded/downloaded using
+          # batch methods. A value of 0 means no limit is set, although
+          # in practice there will always be a message size limitation
+          # of the protocol in use, e.g. GRPC.
+      "actionCacheUpdateCapabilities": { # Describes the server/instance capabilities for updating the action cache. # Capabilities for updating the action cache.
+        "updateEnabled": True or False,
+      },
+      "digestFunction": [ # All the digest functions supported by the remote cache.
+          # Remote cache may support multiple digest functions simultaneously.
+        "A String",
+      ],
+      "symlinkAbsolutePathStrategy": "A String", # Whether absolute symlink targets are supported.
+    },
+    "executionCapabilities": { # Capabilities of the remote execution system. # Capabilities of the remote execution system.
+      "executionPriorityCapabilities": { # Allowed values for priority in # Supported execution priority range.
+          # ResultsCachePolicy
+          # Used for querying both cache and execution valid priority ranges.
+        "priorities": [
+          { # Supported range of priorities, including boundaries.
+            "maxPriority": 42,
+            "minPriority": 42,
+          },
+        ],
+      },
+      "execEnabled": True or False, # Whether remote execution is enabled for the particular server/instance.
+      "digestFunction": "A String", # Remote execution may only support a single digest function.
+    },
+    "highApiVersion": { # The full version of a given tool. # Latest RE API version supported.
+      "major": 42, # The major version, e.g 10 for 10.2.3.
+      "prerelease": "A String", # The pre-release version. Either this field or major/minor/patch fields
+          # must be filled. They are mutually exclusive. Pre-release versions are
+          # assumed to be earlier than any released versions.
+      "minor": 42, # The minor version, e.g. 2 for 10.2.3.
+      "patch": 42, # The patch version, e.g 3 for 10.2.3.
+    },
+    "lowApiVersion": { # The full version of a given tool. # Earliest non-deprecated RE API version supported.
+      "major": 42, # The major version, e.g 10 for 10.2.3.
+      "prerelease": "A String", # The pre-release version. Either this field or major/minor/patch fields
+          # must be filled. They are mutually exclusive. Pre-release versions are
+          # assumed to be earlier than any released versions.
+      "minor": 42, # The minor version, e.g. 2 for 10.2.3.
+      "patch": 42, # The patch version, e.g 3 for 10.2.3.
+    },
+  }</pre>
+</div>
+
+</body></html>
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