api-ref: qos and extra_spec are optional in types view

As Felipe commented in I7ef9b3ea989d65dbd6dfa291ab4752664ed5f935,
extra_specs and qos_specs_id are only populated following policy
authorization: e1d8ec8b26/cinder/api/v2/views/types.py (L31)
So this is to make them optional.

Change-Id: I6f5103b7333b80b9651c279053dbdecd4574c18b

api-ref/source/v3/parameters.yaml

@@ -2314,7 +2314,7 @@ qos_specs_id:
   description: |
     The QoS specifications ID.
   in: body
-  required: true
+  required: false
   type: string
 QoS_support:
   description: |

api-ref/source/v3/volumes-v3-types.inc

@@ -58,7 +58,7 @@ Response Parameters
 
    - volume_type: volume_type_1
    - is_public: is_public_volume_type_required
-   - extra_specs: extra_specs_volume_type_required
+   - extra_specs: extra_specs_volume_type_optional
    - description: description_volume_type_required
    - name: name_volume_type_required
    - id: volume_type_id
@@ -279,7 +279,7 @@ Response Parameters
 
    - volume_type: volume_type_1
    - is_public: is_public_volume_type_required
-   - extra_specs: extra_specs_volume_type_required
+   - extra_specs: extra_specs_volume_type_optional
    - description: description_volume_type_required
    - name: name_volume_type_required
    - id: volume_type_id_body
@@ -323,7 +323,7 @@ Response Parameters
 
    - volume_type: volume_type_1
    - is_public: is_public_volume_type_required
-   - extra_specs: extra_specs_volume_type_required
+   - extra_specs: extra_specs_volume_type_optional
    - description: description_volume_type_required
    - name: name_volume_type_required
 
@@ -393,7 +393,7 @@ Response Parameters
 .. rest_parameters:: parameters.yaml
 
    - volume_types: volume_types
-   - extra_specs: extra_specs_volume_type_required
+   - extra_specs: extra_specs_volume_type_optional
    - name: name_volume_type_required
    - is_public: is_public_volume_type_required
    - description: description_volume_type_required
@@ -449,7 +449,7 @@ Response Parameters
 
    - volume_type: volume_type_1
    - is_public: is_public_volume_type_required
-   - extra_specs: extra_specs_volume_type_required
+   - extra_specs: extra_specs_volume_type_optional
    - description: description_volume_type_required
    - name: name_volume_type_required
    - id: volume_type_id_body