Fix documentation error
There was a mistake in an earlier patch where
'snapshot' was used instead of 'volume'.  This
follow-up patch corrects the wording.
@@ -277,7 +277,7 @@ class VolumeDriverCore(base.CinderInterface):
and setup replication between the newly created volume and
the secondary volume.
- An optional larger size for the new snapshot can be specified. Drivers
+ An optional larger size for the new volume can be specified. Drivers
should check this value and create or expand the new volume to match.
:param volume: The volume to be created.
