Fix deploy keys API annotation
This edits the successful entity annotation for the delete ":id/deploy_keys/:key_id"
. It was incorrectly set to return a non-existent Key
object, which caused the OpenAPI grape-swagger
autogeneration to fail with 500
error.
The OpenAPI V2 documentation will be used for dogfooding API fuzzing as per #372422 (closed) and the OpenAPI autogeneration &8926.