message: Fix incorrect markdown links
diff: @@ -7,6 +7,6 @@ as well as by others that want to consume catalog data.
  ## Links
  -- (Default frontend part of the catalog)[https://github.com/spotify/backstage/tree/master/plugins/catalog]
  -- (Default backend part of the catalog)[https://github.com/spotify/backstage/tree/master/plugins/catalog-backend]
  -- (The Backstage homepage)[https://backstage.io]
  +- [Default frontend part of the catalog](https://github.com/spotify/backstage/tree/master/plugins/catalog)
  +- [Default backend part of the catalog](https://github.com/spotify/backstage/tree/master/plugins/catalog-backend)
  +- [The Backstage homepage](https://backstage.io)
  