docs: Fix formatting for subnetwork field pattern (#190)

* docs: Fix formatting for subnetwork field pattern

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google/cloud/metastore_v1/types/metastore.py

@@ -437,7 +437,7 @@ class Consumer(proto.Message):
                 the subnet's primary range. The subnet is specified in the
                 following form:
 
-                \`projects/{project_number}/regions/{region_id}/subnetworks/{subnetwork_id}
+                ``projects/{project_number}/regions/{region_id}/subnetworks/{subnetwork_id}``
 
                 This field is a member of `oneof`_ ``vpc_resource``.
             endpoint_uri (str):