Doc: Fix build warnings for missing code-block lang
These should specify "none" or a language.
@@ -282,7 +282,7 @@ class CommonAdapter(object):
LUN ID or name are supported in `existing_ref`, like:
- .. code-block::
+ .. code-block:: none
existing_ref:{
'source-id':<LUN id in Unity>
@@ -290,7 +290,7 @@ class CommonAdapter(object):
or
- .. code-block::
+ .. code-block:: none
existing_ref:{
'source-name':<LUN name in Unity>
