[Docs][Backports] Update developer documentation to reflect new automated backport workflow (#19284) - #20351

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update_backport_docs

Commits on Jul 23, 2026

docs(backport): document checklist comment and remove stale screenshot

mrodm
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claude
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docs(backport): document package owner synchronization (#19686)

mrodm
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claude
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docs(backport): expand .backports.yml field documentation (#19264)

mrodm
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claude
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