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docs: add Upendra-Allagadda as a contributor for doc (#2647)

* docs: update README.md [skip ci]

* docs: update .all-contributorsrc [skip ci]

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Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>
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allcontributors[bot] committed
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Parent: ffbcbdc
Committed by GitHub <noreply@github.com> on 10/14/2023, 11:02:57 AM