message: docs: improve 404 example
diff: @@ -93,7 +93,11 @@ In this specific scenario we are using a [custom regexp](/guide/essentials/route
  ```js
  this.$router.push({
  name: 'NotFound',
  - params: { pathMatch: this.$route.path.split('/') },
  + // preserve current path and remove the first char to avoid the target URL starting with `//`
  + params: { pathMatch: this.$route.path.substring(1).split('/') },
  + // preserve existing query and hash if any
  + query: this.$route.query,
  + hash: this.$route.hash,
  })
  ```
  