message: Fix incorrect backend path in docs
diff: @@ -40,7 +40,7 @@ to the backend. These are places where the backend can find some entity descript
  data to consume and serve.
  To get started, you can issue the following after starting the backend, from inside
  -the `packages/catalog-backend` directory:
  +the `plugins/catalog-backend` directory:
  ```bash
  yarn mock-catalog-data
  