Fix openapi docs for playlist videos response

This is the playlist element id, used to update or delete elements in
the list. The old description and example made it look like it is the
video object id.

Author: jakmeier

support/doc/api/openapi.yaml

@@ -5396,7 +5396,7 @@ paths:
                       type: object
                       properties:
                         id:
-                          description: object id for the video
+                          description: Playlist element id
                           allOf:
                             - $ref: '#/components/schemas/id'
                         position:
@@ -5410,7 +5410,7 @@ paths:
                         stopTimestamp:
                           type: integer
                           nullable: true
-                          example: 42
+                          example: 41
                           format: seconds
                         video:
                           $ref: '#/components/schemas/Video'