Add support for addressing subgroups by paths to the keycloak_user module (#9898)

* Add support for addressing subgroups by paths to the keycloak_user module (issue #9647)

* Apply suggestions from code review.

Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>

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Co-authored-by: Felix Fontein <felix@fontein.de>
Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>

plugins/modules/keycloak_user.py

@@ -101,6 +101,9 @@ options:
   groups:
     description:
       - List of groups for the user.
+        Groups can be referenced by their name, like V(staff), or their path, like V(/staff/engineering).
+        The path syntax allows you to reference subgroups, which is not possible otherwise.
+        This is possible since community.general 10.6.0.
     type: list
     elements: dict
     default: []