[Backport 1.3] Add release notes for 1.3.6#475

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sejli merged 1 commit intoopensearch-project:1.3from sejli:backport/backport-474-to-1.3

Oct 3, 2022

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Commits on Oct 3, 2022

Merge pull request opensearch-project#474 from sejli/release-notes-1.3.6
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