Sorry I missed this earlier. RFC Y can update RFC X in general, or in one or more particular sections. RFC Y cannot "obsolete one section" of RFC X. RFC Y can completely obsolete RFC X if it restates everything.
See https://www.ietf.org/archive/id/draft-kuehlewind-update-tag-04.txt for a bit of history on "updates" and its lack of stated definition. --Paul Hoffman
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