Cherry-pick to master: docs: add link to release notes for 7.9.2 (#21405)#21419

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kuisathaverat merged 1 commit intoelastic:masterfrom kuisathaverat:backport/master/pr-21405

Sep 30, 2020

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Commits on Sep 30, 2020

docs: add link to release notes for 7.9.2 (elastic#21405 )
kuisathaverat
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