Doc: Remove unnecessary note
Cinder v1 API is removed and hence the note on the docs seems
unnecessary.
This patch removes it.
@@ -30,12 +30,6 @@ is ``in-use`` when it is attached to an instance. The backup of an
``in-use`` volume means your data is crash consistent. The ``force``
flag is False by default.
-.. note::
-
- The ``incremental`` and ``force`` flags are only available since block
- storage API v2. You have to specify ``[--os-volume-api-version 2]`` in the
- ``cinder`` command-line interface to use this parameter.
-
.. note::
The ``force`` flag is new in OpenStack Liberty.
