trivial: Add min_version: 3.1 to api_ref for upload volume

This patchset adds min_version: 3.1 to protected and
visiblity params which were added to upload volume to
image action in microversion 3.1 [0][1][2].

[0] 7d95fb79c4/cinder/api/schemas/volume_actions.py (L150)
[1] https://github.com/openstack/cinder/blob/master/cinder/api/contrib/volume_actions.py#L232
[2] 7d95fb79c4/cinder/api/microversions.py (L42)

Change-Id: Ibdfa086d9bdadd11263b0a71aa3fff65faddb32d

api-ref/source/v3/parameters.yaml

@@ -2133,6 +2133,7 @@ protected:
   in: body
   required: false
   type: boolean
+  min_version: 3.1
 provider:
   description: |
     The class that provides encryption support.
@@ -2767,6 +2768,7 @@ visibility_1:
   in: body
   required: false
   type: string
+  min_version: 3.1
 volume:
   description: |
     A ``volume`` object.