Update broken heading link
What does this MR do and why?
Describe in detail what your merge request does and why.
The link should go to https://docs.gitlab.com/ee/administration/geo/replication/troubleshooting.html#check-the-health-of-the-secondary-site
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.