gitaly: Add network workaround when behind an NLB
What does this MR do and why?
A customer experienced an issue where Gitaly server was unable to call itself due to network configuration.
This commit adds a note in the documentation to warn about that possibility and to provide a workaround.
Relevant resources:
References
- https://gitlab.com/gitlab-org/gitaly/-/issues/6966l give reviewers and future readers helpful context.
Screenshots or screen recordings
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