DOC-14003 downgrade doc updates#4103

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ggray-cb wants to merge 4 commits intorelease/8.0from

DOC-14003_downgrade_doc_updates

Commits on Apr 3, 2026

Initial draft
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Commits on Apr 6, 2026

General edits/cleanup.
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Commits on Apr 13, 2026

Some minor fixes
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Commits on Apr 15, 2026

Added links to the Online Downgrade procedure steps.
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