Revert "Fix "broken" docs build. (#3422)" (#3439)

This reverts commit 90565b0043d40bae9eb6a2e905aa8f22c8951029.

Author: dhermes

packages/google-cloud-pubsub/google/cloud/pubsub/client.py

@@ -226,6 +226,7 @@ def topic(self, name, timestamp_messages=False):
         .. literalinclude:: snippets.py
            :start-after: [START client_topic]
            :end-before: [END client_topic]
+           :dedent: 4
 
         :type name: str
         :param name: the name of the topic to be constructed.
@@ -248,6 +249,7 @@ def subscription(self, name, ack_deadline=None, push_endpoint=None,
         .. literalinclude:: snippets.py
            :start-after: [START client_subscription]
            :end-before: [END client_subscription]
+           :dedent: 4
 
         :type name: str
         :param name: the name of the subscription to be constructed.