Fix group_type_id in api-ref

group_type_id in GET/DELETE/PUT /group_types/group_type_id
is mentioned as optional path variable which is not true.

- 7c66eb3d97/cinder/api/v3/group_types.py (L101)

This id is mandatory and doc should be updated.
This create confusion while test case or using this API,
example - https://review.openstack.org/#/c/521634/4/tempest/lib/services/volume/v3/group_types_client.py
Closes-Bugs: # 1733504

Change-Id: I220cd20fefbe83ba8c392ab6b1679620d6a1d934

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

@@ -25,7 +25,7 @@ Request
 .. rest_parameters:: parameters.yaml
 
    - project_id: project_id_path
-   - group_type_id: group_type_id
+   - group_type_id: group_type_id_1
    - group_type: group_type
    - name: name_16
    - description: description_12
@@ -74,7 +74,7 @@ Request
 .. rest_parameters:: parameters.yaml
 
    - project_id: project_id_path
-   - group_type_id: group_type_id
+   - group_type_id: group_type_id_1
 
 
 Response Parameters
@@ -114,7 +114,7 @@ Request
 
 .. rest_parameters:: parameters.yaml
 
-   - group_type_id: group_type_id
+   - group_type_id: group_type_id_1
    - project_id: project_id_path
 
 

api-ref/source/v3/parameters.yaml

@@ -67,12 +67,6 @@ group_snapshot_id:
   in: path
   required: true
   type: string
-group_type_id:
-  description: |
-    The UUID for an existing group type.
-  in: path
-  required: false
-  type: string
 group_type_id_1:
   description: |
     The UUID for an existing group type.