message: docs: use localhost instead of 127.0.0.1
diff: @@ -133,9 +133,9 @@ familiar with. For other options, see
  Go to
  [https://github.com/settings/applications/new](https://github.com/settings/applications/new)
  to create your OAuth App. The `Homepage URL` should point to Backstage's
  -frontend, in our tutorial it would be `http://127.0.0.1:3000`. The
  +frontend, in our tutorial it would be `http://localhost:3000`. The
  `Authorization callback URL` will point to the auth backend, which will most
  -likely be `http://127.0.0.1:7007/api/auth/github/handler/frame`.
  +likely be `http://localhost:7007/api/auth/github/handler/frame`.
  <p align='center'>
  <img src='../assets/getting-started/gh-oauth.png' alt='Screenshot of the GitHub OAuth creation page' />
  