Merge pull request #47781 from kubernetes/Okabe-Junya/update-ja-job

[ja] Update title in job.md

Author: k8s-ci-robot

content/ja/docs/concepts/workloads/controllers/job.md

@@ -1,5 +1,5 @@
 ---
-title: Jobs
+title: Job
 content_type: concept
 feature:
   title: バッチ実行