Clarify confirmation prompt (#8589)

Entering any value causes the play to proceed, e.g., entering "no<Enter>". (This is simply how Ansible's pause module behaves.)

roles/upgrade/pre-upgrade/tasks/main.yml

@@ -3,7 +3,7 @@
 - name: Confirm node upgrade
   pause:
     echo: yes
-    prompt: "Ready to upgrade node ?"
+    prompt: "Ready to upgrade node? (Press Enter to continue or Ctrl+C for other options)"
   when:
     - upgrade_node_confirm