test(fleet): close documentation code grammar

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/fleet/operations/backup-restore.md

@@ -30,7 +30,7 @@ connector entry.
 
 The preview evidence deliberately records:
 
-- `executable: false`;
+- executable: false;
 - required backup artifacts;
 - source and candidate identities;
 - lifecycle observations and resulting desired states;