* Add explanation and example to vendor option
##### SUMMARY
<!— Your description here –>
##### ISSUE TYPE
- Docs Pull Request
+label: docsite_pr
* Update plugins/modules/identity/keycloak/keycloak_user_federation.py
Co-authored-by: Felix Fontein <felix@fontein.de>
Co-authored-by: Felix Fontein <felix@fontein.de>
(cherry picked from commit 7b86fa6a7d)
Co-authored-by: clovis-monmousseau <58973012+clovis-monmousseau@users.noreply.github.com>