Auto docs update

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GH Action for updating docs submodule

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https://github.com/marketplace/actions/checkout-submodules
https://github.com/marketplace/actions/submodule-branch-check
https://github.com/jtmullen/submodule-branch-check-action/blob/0a86f27829721b64cc0a761e72905d8b5ac9e058/entrypoint.sh#L55