Merge pull request #3880 from elliott-king/patch-2

Docs update: clarify json error handling

docs/blueprints.rst

@@ -270,7 +270,7 @@ at the application level using the ``request`` proxy object::
     @app.errorhandler(405)
     def _handle_api_error(ex):
         if request.path.startswith('/api/'):
-            return jsonify_error(ex)
+            return jsonify(error=str(ex)), ex.code
         else:
             return ex