GitLab

* doc/emacs/maintaining.texi (VC Change Log): Document vc-log-incoming and
vc-log-outgoing.
(Merging): Document vc-find-conflicted-file.

* doc/emacs/rmail.texi (Rmail Display): Document Rmail MIME support more
accurately.

* doc/lispref/commands.texi (Accessing Mouse): Note that a header line is not
included in the row of posn-col-row.

* etc/NEWS: Remove +++ and --- lines.