Apply suggestions from code review

Co-authored-by: Abhijeet Kasurde <akasurde@redhat.com>

changelogs/fragments/85542-warning-when-using-seuser-on-alpine.yml

@@ -1,2 +1,2 @@
 bugfixes:
-  - user - The seuser parameter will be ignored on Alpine and print warning
+  - user - The seuser parameter will be ignored on Alpine and print a warning (https://github.com/ansible/ansible/issues/85542).

lib/ansible/modules/user.py

@@ -44,7 +44,7 @@ options:
     seuser:
         description:
             - Optionally sets the C(seuser) type C(user_u) on SELinux enabled systems.
-            - This parameter will be ignored on Alpine and Buildroot.
+            - This parameter will be ignored on macOS, *BSD, BusyBox-based distros and Buildroot.
         type: str
         version_added: "2.1"
     group: