[9.2] (backport #10184) [docs] Refine Markdown release notes structure #10247
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What does this PR do?
Refines the Markdown release notes structure to be compatible with elastic/elastic-agent-changelog-tool#220.
Why is it important?
These updates will (1) eliminate any manual steps in the resulting elastic-agent release notes PR outside of copy edits, and (2) reduce the chance of conflicts when forward porting to later minors and main (like we ran into in #10032 and #10031).
Disruptive User Impact
The resulting rendered pages will not change.
How to test this PR locally
There will be a docs preview.
Related issues
elastic/elastic-agent-changelog-tool#220
cc @karenzone
This is an automatic backport of pull request #10184 done by Mergify.