safe-ts redirects to wrong page

[choudharypankaj]

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. safe-ts link redirects to wrong page

2. Describe your suggestion or addition. It should redirect to: https://docs.pingcap.com/tidb/stable/troubleshoot-stale-read/#what-is-safe-ts

3. Provide some reference materials (such as documents and websites) if you could.