message: docs: fix link to vale config
diff: @@ -24,7 +24,7 @@ the code.
  - [`.github/`](https://github.com/backstage/backstage/tree/master/.github) -
  Standard GitHub folder. It contains - amongst other things - our workflow
  definitions and templates. Worth noting is the
  - [styles](https://github.com/backstage/backstage/tree/master/.github/styles)
  + [vale](https://github.com/backstage/backstage/tree/master/.github/vale)
  sub-folder which is used for a markdown spellchecker.
  - [`.yarn/`](https://github.com/backstage/backstage/tree/master/.yarn) -
  