add docs for star repo api

endpoints/api/user.py

@@ -723,6 +723,7 @@ class StarredRepositoryList(ApiResource):
     raise NotFound()
 
 @resource('/v1/user/starred/<repopath:repository>')
+@path_param('repository', 'The full path of the repository. e.g. namespace/name')
 class StarredRepository(RepositoryParamResource):
   """ Operations for managing a specific starred repository. """
   @nickname('deleteStar')