docs: runner 13 marks the self-replacing run as failed

Under runner 13 the run that recreates the runner ends as failed, not
cancelled (run 450); say so, and where its log stops, so it is not
mistaken for a real failure.

Assisted-by: Claude:opus-5-5

ansible/README.md

@@ -91,7 +91,9 @@ variable, let the pipeline apply it, then remove the old volume.
 Renovate PRs. Applying either one recreates the runner while it runs
 the very job that applies it:
 
-- that run ends as *cancelled* after everything else has been applied,
+- that run ends as *failed* (runner 13; *cancelled* on older runners)
+  after everything else has been applied, its log stopping in the
+  forgejo_runner role,
   and its job container stays behind on asxpio-services
   (`docker ps | grep FORGEJO-ACTIONS-TASK`); remove it;
 - the next run confirms the result. The workflow only triggers on