Fix api-ref for reset group snapshot

reset-group-snalshot api-ref not correct for 'status' attribute.
That is mentioned as optional for request.
'status' in API request is mandatory attribute.

Also 'project_id' is mentioned as body element instead of path.

Those are confusing while implementing tests for this API
 - https://review.openstack.org/#/c/495735/
https://developer.openstack.org/api-ref/block-storage/v3/#reset-group-snapshot-status
Closes-Bug: #1719930

Change-Id: Id2016f86d0eae60d96df7a12eda1bbec9d1129a8

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

@@ -225,7 +225,7 @@ Request
 
 .. rest_parameters:: parameters.yaml
 
-   - project_id: project_id
+   - project_id: project_id_path
    - group_snapshot_id: group_snapshot_id
    - reset_status: reset_status
    - status: status_7

api-ref/source/v3/parameters.yaml

@@ -2478,7 +2478,7 @@ status_7:
   description: |
     The ``status`` of the generic group snapshot.
   in: body
-  required: false
+  required: true
   type: string
 status_8:
   description: |