docs: add 'Redwood' to titles

[cmltaWt0]

This adds "Redwood Release" to titles in the open-release/redwood.master branch as instructed by the release instructions: https://openedx.atlassian.net/wiki/spaces/COMM/pages/19662426/Process+to+Create+an+Open+edX+Release#5.-Update-the-documentation

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[cmltaWt0]

@mariajgrimaldi @kdmccormick please review

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