Document custom merge drivers
What does this MR do and why?
Document custom merge drivers
Custom merge drivers in Git are supported in GitLab. Document how they can be used.
addresses: #18830 (closed)
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.
Edited by John Cai