Doc: update storwize cinder driver configuration guide
There is something wrong in storwize cinder driver configuration guide.
This patch remove 1 unsupported volume type configuration and adds 2
supported volume type configurations.
Closes-Bugs:
@@ -320,7 +320,8 @@ driver:
- mirror_pool
- volume_topology
- peer_pool
-- host_site
+- flashcopy_rate
+- cycle_period_seconds
These keys have the same semantics as their counterparts in the
configuration file. They are set similarly; for example, ``rsize=2`` or
@@ -462,7 +463,9 @@ modify volume types, you can also change these extra specs properties:
- peer_pool
-- host_site
+- flashcopy_rate
+
+- cycle_period_seconds
.. note::
