doc: am: revert Message-ID trailer claim
I claimed in 3c18135b (doc: am: say that --message-id adds a trailer, 2026-02-09) that `git am --message-id` adds a Git trailer. But that isn’t the case; for the case of a commit message with a subject, body, and no trailer block: <subject> <paragrah> It just appends the line right after `paragraph`: <subject> <paragraph> Message-ID: <message-id_trailer.323@msgid.xyz> It does work for two other cases though, namely subject-only and with an existing trailer block. This is at best an inconsistency and arguably a bug, but we’re at the trailing end of the release cycle now. So reverting the doc is safer than making msg-id act as a trailer, for now. Revert this hunk from commit 3c18135b except the only useful change (“Also use inline-verbatim for `Message-ID`”). Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name> Signed-off-by: Junio C Hamano <gitster@pobox.com>