Update feature flag docs about milestone
What does this MR do and why?
This MR is meant to clarify the wording in our docs about which milestone to put into the feature-flag yml file after it turned out to leave too much room for interpretation.
See this Discussion: !95282 (comment 1060317696)
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 Jannik Lehmann