Cherry-pick to master: docs: Prepare Changelog for 7.9.3 (#22073)#22075

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kuisathaverat merged 1 commit intoelastic:masterfrom kuisathaverat:backport/master/pr-22073

Oct 22, 2020

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Commits on Oct 22, 2020

docs: Prepare Changelog for 7.9.3 (elastic#22073 )

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