message: fix syntax issue in document-caching.md
diff: @@ -86,7 +86,7 @@ to invalidate an additional entity.
  const [result, execute] = useMutation(`mutation($name: String!) { createUser(name: $name) }`);
  const onClick = () => {
  - execute({ context: { additionalTypenames: ['Wallet'] } });
  + execute({ name: 'newName' }, { additionalTypenames: ['Wallet'] });
  };
  ```
  