Added some explanations.

nuke.yml

@@ -1,10 +1,13 @@
 ---
+# This playbook will reset the instalation to facilitate a new installation.
+# All data is lost!
 - hosts: all
   become: True
   name: Dummy to gather facts
   tasks:
-    - shell: "systemctl stop docker"
     - name: Stop docker service
+    - shell: "systemctl stop docker"
+    - name: Verify docker is stopped.
       systemd:
         name: docker
         state: stopped