message: Fix documentation to match correct plugin URL.
diff: @@ -48,7 +48,7 @@ This will think for a bit, and then say `Listening on :7007`. In a different
  terminal window, now run
  ```sh
  -curl localhost:7007/carmen/health
  +curl localhost:7007/carmen-backend/health
  ```
  This should return `{"status":"ok"}`. Success! Press `Ctrl + c` to stop it
  