Fix datastore __init__ docstring.

[daspecster]

This fixes the issue with datastore index doc not rendering the examples.

http://daspecster.github.io/gcloud-python/#/docs/master/gcloud/datastore

@dhermes, one small step closer but far far from perfect. I need to detect lists so that renders better.

[dhermes]

LGTM. Looks like that would've failed Sphinx rendering right?

[daspecster]

Right, it would have but sphinx doesn't pull in the __init__.py's unless you force it too I think.
I think you need to add __all__ to the __init__.py to get it to work?

http://stackoverflow.com/a/30866624/89702

[dhermes]

@daspecster We just never reference the base subpackage:

$ git grep automodule | grep gcloud | grep datastore
docs/datastore-batches.rst:.. automodule:: gcloud.datastore.batch
docs/datastore-client.rst:.. automodule:: gcloud.datastore.client
docs/datastore-client.rst:.. automodule:: gcloud.datastore.connection
docs/datastore-entities.rst:.. automodule:: gcloud.datastore.entity
docs/datastore-helpers.rst:.. automodule:: gcloud.datastore.helpers
docs/datastore-keys.rst:.. automodule:: gcloud.datastore.key
docs/datastore-queries.rst:.. automodule:: gcloud.datastore.query
docs/datastore-transactions.rst:.. automodule:: gcloud.datastore.transaction

and we even have a docs verifier which intentionally ignores that module

$ git grep 'gcloud.\datastore\.__init__'
scripts/verify_included_modules.py:    'gcloud.datastore.__init__',