message: auth-backend: tweak oauth2-proxy example
diff: # You'll need to provide your own GitHub client ID and secret through
  # GITHUB_CLIENT_ID and GITHUB_CLIENT_SECRET.
  #
  -# The following env vars can be used to configure `yarn dev` to work with the proxy:
  -#
  -# APP_CONFIG_app_baseUrl=http://localhost APP_CONFIG_app_listen_port=3000 \
  -# APP_CONFIG_backend_baseUrl=http://localhost APP_CONFIG_backend_listen_port=7007 yarn dev
  -#
  -# The only manual modification you need to make to the app is to switch the
  +# The only modifications you need to make to run this example is to switch the
  # SignInPage to the following:
  #
  # <ProxiedSignInPage {...props} provider="myproxy" />
  #
  -# Once done, you can run the following and then navigate to http://localhost:
  +# You also need to switch out the baseUrl and listen port of both the frontend and
  +# backend, but we can do that through env vars when running `yarn dev`:
  +#
  +# APP_CONFIG_app_baseUrl=http://localhost APP_CONFIG_app_listen_port=3000 \
  +# APP_CONFIG_backend_baseUrl=http://localhost APP_CONFIG_backend_listen_port=7007 yarn dev
  +#
  +# Once done, you can run the following from the root and then navigate to http://localhost
  #
  -# ./docker-compose.oauth2-proxy.yaml up
  +# ./plugins/auth-backend/examples/docker-compose.oauth2-proxy.yaml up
  version: '3'
  services:
  