message: Fix docs on Helm install commands.
diff: @@ -33,7 +33,7 @@ Then use it to run:
  ```bash
  git clone https://github.com/backstage/backstage.git
  -cd contrib/chart/backstage
  +cd backstage/contrib/chart/backstage
  helm dependency update
  helm install -f backstage-mydomain.yaml backstage .
  ```
  