Merge branch 'kh/doc-am-xref'

Doc update.

* kh/doc-am-xref:
  doc: am: correct to full --no-message-id
  doc: am: revert Message-ID trailer claim

Author: gitster

Documentation/git-am.adoc

@@ -84,15 +84,14 @@ OPTIONS
 
 -m::
 --message-id::
-	Pass the `-m` flag to linkgit:git-mailinfo[1], so that the
-	`Message-ID` header is added as a trailer (see
-	linkgit:git-interpret-trailers[1]).  The `am.messageid`
-	configuration variable can be used to specify the default
-	behaviour.
+	Pass the `-m` flag to linkgit:git-mailinfo[1],
+	so that the `Message-ID` header is added to the commit message.
+	The `am.messageid` configuration variable can be used to specify
+	the default behaviour.
 
 --no-message-id::
 	Do not add the Message-ID header to the commit message.
-	`no-message-id` is useful to override `am.messageid`.
+	`--no-message-id` is useful to override `am.messageid`.
 
 -q::
 --quiet::