add documentation for the encryption_config argument

Author: larkee

google/cloud/spanner_v1/database.py

@@ -92,6 +92,14 @@ class Database(object):
     :param pool: (Optional) session pool to be used by database.  If not
                  passed, the database will construct an instance of
                  :class:`~google.cloud.spanner_v1.pool.BurstyPool`.
+
+    :type encryption_config:
+        :class:`~google.cloud.spanner_admin_database_v1.types.EncryptionConfig`
+        or :class:`dict`
+    :param encryption_config:
+        (Optional) Encryption information about the database.
+        If a dict is provided, it must be of the same form as the protobuf
+        message :class:`~google.cloud.spanner_admin_database_v1.types.EncryptionConfig`
     """
 
     _spanner_api = None

google/cloud/spanner_v1/instance.py

@@ -364,6 +364,14 @@ def database(
                     :class:`~google.cloud.spanner_v1.pool.AbstractSessionPool`.
         :param pool: (Optional) session pool to be used by database.
 
+        :type encryption_config:
+            :class:`~google.cloud.spanner_admin_database_v1.types.EncryptionConfig`
+            or :class:`dict`
+        :param encryption_config:
+            (Optional) Encryption information about the database.
+            If a dict is provided, it must be of the same form as the protobuf
+            message :class:`~google.cloud.spanner_admin_database_v1.types.EncryptionConfig
+
         :rtype: :class:`~google.cloud.spanner_v1.database.Database`
         :returns: a database owned by this instance.
         """