* doc/misc/message.texi (Superseding): Don't document the default value
of 'message-ignored-supersedes-headers' here; the list was out-of-date,
and is likely to become out-of-date again in the future if updated.
It's also easy enough to look up for users outside of Info.
(cherry picked from commit
19791839cfbb9202aff8a8d476ec76741592c97d)
@vindex message-ignored-supersedes-headers
Headers matching the @code{message-ignored-supersedes-headers} are
-removed before popping up the new message buffer. The default is@*
-@samp{^Path:\\|^Date\\|^NNTP-Posting-Host:\\|^Xref:\\|^Lines:\\|@*
-^Received:\\|^X-From-Line:\\|^X-Trace:\\|^X-Complaints-To:\\|@*
-Return-Path:\\|^Supersedes:\\|^NNTP-Posting-Date:\\|^X-Trace:\\|@*
-^X-Complaints-To:\\|^Cancel-Lock:\\|^Cancel-Key:\\|^X-Hashcash:\\|@*
-^X-Payment:\\|^Approved:}.
+removed before popping up the new message buffer.