Improve gems documentation
What does this MR do and why?
This documents !124283 (comment 1451621531).
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 Kamil Trzciński (Back 2025-01-01)