message: docs: nextjs tutorial add missing async
diff: @@ -58,7 +58,7 @@ const Home: NextPage = () => {
  setTasks(tasks.map(t => t === task ? { ...task, ...values } : t));
  };
  - const saveTask = () => {
  + const saveTask = async () => {
  const savedTask = await remult.repo(Task).save(task);
  setTasks(tasks.map(t => t === task ? savedTask : t));
  };
  @@ -115,7 +115,7 @@ const Home: NextPage = () => {
  setTasks(tasks.map(t => t === task ? { ...task, ...values } : t));
  }
  - const saveTask = () => {
  + const saveTask = async () => {
  const savedTask = await remult.repo(Task).save(task);
  setTasks(tasks.map(t => t === task ? savedTask : t));
  }
  