Missing docs for Datastore Admin

[turbaszek]

Hello,

The documentation:
https://googleapis.dev/python/datastore/latest/client.html
has serious defects because it has no documentation for

python-datastore/google/cloud/datastore_admin_v1/gapic/datastore_admin_client.py

Lines 52 to 57 in 677bb7b

	class DatastoreAdminClient(object):
	"""
	Google Cloud Datastore Admin API
	The Datastore Admin API provides several admin services for Cloud Datastore.

We only have documentation for datastore.Client.

Similar issues has been raised for Firestore client: googleapis/python-firestore#30