docs: format cron jobs doc

docs/automation/cron-jobs.md

@@ -385,6 +385,7 @@ openclaw cron add \
 ```
 
 Agent selection (multi-agent setups):
+
 ```bash
 # Pin a job to agent "ops" (falls back to default if that agent is missing)
 openclaw cron add --name "Ops sweep" --cron "0 6 * * *" --session isolated --message "Check ops queue" --agent ops
@@ -395,6 +396,7 @@ openclaw cron edit <jobId> --clear-agent
 ```
 
 Manual run (debug):
+
 ```bash
 openclaw cron run <jobId> --force
 ```