Update instructions for using a locally modified Gitaly RPC gem
What does this MR do and why?
The instructions for using a locally modified Gitaly RPC gem are out of date and do not work anymore. This MR adds steps that currently work.
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.