message: updated migration docs
diff: @@ -71,12 +71,12 @@ Usage:
  Connect to the instance where the app is deployed:
  ```sh
  -waypoint exec -app=hub bash
  +waypoint exec -app=hub sh
  ```
  Then, add node to the PATH and run the migrations:
  ```sh
  heroku@ip-10-91-1-8:/ cd /workspace
  heroku@ip-10-91-1-8:/workspace$ PATH=$PATH:/layers/heroku_nodejs-engine/nodejs/bin/;
  -heroku@ip-10-91-1-8:/workspace$ npm run db:migrate up
  +heroku@ip-10-91-1-8:/workspace$ node dist/hub.js db migrate up
  ```
  \ No newline at end of file
  