Add example to rpm_ostree_pkg (#8556)

* Update rpm_ostree_pkg.py

expand examples list with 'until' example

* Apply suggestions from code review.

---------

Co-authored-by: Felix Fontein <felix@fontein.de>

plugins/modules/rpm_ostree_pkg.py

@@ -55,6 +55,17 @@ EXAMPLES = r'''
   community.general.rpm_ostree_pkg:
     name: nfs-utils
     state: absent
+
+# In case a different transaction is currently running the module would fail.
+# Adding a delay can help mitigate this problem:
+- name: Install overlay package
+  community.general.rpm_ostree_pkg:
+    name: nfs-utils
+    state: present
+  register: rpm_ostree_pkg
+  until: rpm_ostree_pkg is not failed
+  retries: 10
+  dealy: 30
 '''
 
 RETURN = r'''