Normalize module docstring patterns #1171

$ git grep "API wrapper"
gcloud/bigquery/__init__.py:"""Google Cloud BigQuery API wrapper.
gcloud/dns/__init__.py:"""Google Cloud DNS API wrapper.
gcloud/pubsub/__init__.py:"""Google Cloud Pubsub API wrapper.
gcloud/resource_manager/__init__.py:"""Google Cloud Resource Manager API wrapper
gcloud/search/__init__.py:"""Google Cloud Search API wrapper."""
$ git grep "interacting with API"
gcloud/bigquery/client.py:"""gcloud bigquery client for interacting with API."""
gcloud/client.py:"""gcloud client base class for interacting with API."""
gcloud/dns/client.py:"""gcloud dns client for interacting with API."""
gcloud/pubsub/client.py:"""gcloud pubsub client for interacting with API."""
gcloud/search/client.py:"""gcloud dns client for interacting with API."""
gcloud/storage/client.py:"""gcloud storage client for interacting with API."""