Update YAML syntax example for user assignments to match official docs for Role Strategy plugin

[walidmadad]

Hi,

In the example config for the repository (demo for the Role‑Strategy Plugin version 840.v206ff7f7312e) I noticed the user assignments are defined like this:

assignments:
  - user: "userId"

However, according to the official change in the plugin (see pull request #230), the new supported format is:

entries:
  - user: "userId"

Could you please update the example in this repository to reflect this new syntax? This will help avoid confusion for users following the demo.

Thanks for maintaining this project!

[oleg-nenashev]

Hi. Not that I maintain this project too much, it would definitely use an update. PRs are also welcome!