chore: [release-2.9.x] docs: Update Release Notes for 2.9.10 #14102
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Backport 7a15fa2 from #14100
What this PR does / why we need it:
Update the Release Notes for 2.9.9 and 2.9.10 releases.
https://github.com/grafana/loki/releases/tag/v2.9.9
https://github.com/grafana/loki/releases/tag/v2.9.10