fix: change docstring to be consistent

test/test_suite.py

@@ -199,7 +199,10 @@ def test_select_exists_false(self, connection):
 class IntegerTest(_IntegerTest):
     @provide_metadata
     def _round_trip(self, datatype, data):
-        """This is the helper method for integer class tests which creates table and
+        """
+        SPANNER OVERRIDE:
+
+        This is the helper method for integer class tests which creates table and
         perform insert operation.
         Cloud Spanner supports tables with empty primary key, but
         only single one row can be inserted into such a table -
@@ -235,7 +238,10 @@ def _round_trip(self, datatype, data):
 
     @provide_metadata
     def _literal_round_trip(self, type_, input_, output, filter_=None):
-        """Sql alchemy is not able cleanup data and drop the table correctly,
+        """
+        SPANNER OVERRIDE:
+
+        Sql alchemy is not able cleanup data and drop the table correctly,
         table was already exists after related tests finished, so it doesn't
         create a new table and when started tests for other data type  following
         insertions will fail with `400 Duplicate name in schema: t.