ovirt_disk: Fix documentation of logical unit id

ovirt_disk update documentation of logical unit id from lun_id to id
to alling with the code

Signed-off-by: Martin Necas <[email protected]>

Author: mnecas

plugins/modules/ovirt_disk.py

@@ -157,7 +157,7 @@
             target:
                 description:
                     - iSCSI target.
-            lun_id:
+            id:
                 description:
                     - LUN id.
             username: