Add documentation for all path parameters

endpoints/api/superuser.py

@@ -8,7 +8,7 @@ from flask import request
 from endpoints.api import (ApiResource, nickname, resource, validate_json_request, request_error,
                            log_action, internal_only, NotFound, require_user_admin, format_date,
                            InvalidToken, require_scope, format_date, hide_if, show_if, parse_args,
-                           query_param, abort)
+                           query_param, abort, path_param)
 
 from endpoints.api.logs import get_logs
 
@@ -86,6 +86,7 @@ class SuperUserList(ApiResource):
 
 
 @resource('/v1/superuser/users/<username>')
+@path_param('username', 'The username of the user being managed')
 @internal_only
 @show_if(features.SUPER_USERS)
 class SuperUserManagement(ApiResource):