Update SQL plugin documentation#830

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Yury-Fridlyand wants to merge 3 commits intoopensearch-project:mainfrom

Yury-Fridlyand:main

Commits on Aug 4, 2022

Merge pull request #1 from Yury-Fridlyand/dev-update-sql-relevance-docs

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MaxKsyunz
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Commits on Aug 9, 2022

Address PR feedback.
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Commits on Aug 17, 2022

Address PR feedback by @joshuali925.
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