Manila VMAX docs -  clarify snapshot support
As snapshot support is disabled by default, this clarifies how to enable
it for both create snapshot of share and create share from snapshot.
@@ -341,6 +341,49 @@ SSL Support
#. Restart manila services.
+Snapshot Support
+~~~~~~~~~~~~~~~~
+
+Snapshot support is disabled by default, so in order to allow shapshots for a
+share type, the ``snapshot_support`` extra spec must be set to True.
+Creating a share from a snapshot is also disabled by default so
+``create_share_from_snapshot_support`` must also be set to True if this
+functionality is required.
+
+For a new share type:
+
+.. code-block:: console
+
+ $ manila type-create --snapshot_support True \
+ --create_share_from_snapshot_support True \
+ ${share_type_name} True
+
+For an existing share type:
+
+.. code-block:: console
+
+ $ manila type-key ${share_type_name} \
+ set snapshot_support=True
+ $ manila type-key ${share_type_name} \
+ set create_share_from_snapshot_support=True
+
+To create a snapshot from a share where snapshot_support=True:
+
+.. code-block:: console
+
+ $ manila snapshot-create ${source_share_name} --name ${target_snapshot_name}
+
+To create a target share from a shapshot where create_share_from_snapshot_support=True:
+
+.. code-block:: console
+
+ $ manila create cifs 3 --name ${target_share_name} \
+ --share-network ${share_network} \
+ --share-type ${share_type_name} \
+ --metadata source=snapshot \
+ --snapshot-id ${snapshot_id}
+
+
IPv6 support
~~~~~~~~~~~~
IPv6 support for VMAX Manila driver is introduced in Rocky release. The feature is
