`ADMIN SHOW DDL JOB QUERIES LIMIT m OFFSET` changes

[xhebox]

Change Request

Please answer the following questions before submitting your issue. Thanks!

1. Describe what you find is inappropriate or missing in the existing docs.

A new syntax is added. Ref pingcap/tidb#36480.

2. Describe your suggestion or addition.

3. Provide some reference materials (documents, websites, etc) if you could.