message: docs: improve guards
diff: @@ -37,7 +37,8 @@ All of the the things above **work the same way with `async` functions** and Pro
  ```js
  router.beforeEach(async (to, from) => {
  // canUserAccess() returns `true` or `false`
  - return await canUserAccess(to)
  + const canAccess = await canUserAccess(to)
  + if (!canAccess) return '/login'
  })
  ```
  