emacs: Remove "M" key binding for marking all lines.

* emacs/guix-list.el: Split 'guix-list-mark' into internal and
  interactive functions.  Remove "M" key binding, use "C-u m" instead.
  (guix-list--mark): New function.  Use it in other marking functions.
  (guix-list-mark): Mark all lines with a prefix argument.
* doc/emacs.texi (Emacs List buffer): Document changes in the key
  bindings.

1 files changed, 1 insertions, 3 deletions

diff --git a/doc/emacs.texi b/doc/emacs.texi
index e1d14a4c4a..9678570d58 100644
--- a/doc/emacs.texi
+++ b/doc/emacs.texi
@@ -213,9 +213,7 @@ Default key bindings available for both ``package-list'' and
 
 @table @kbd
 @item m
-Mark the current entry.
-@item M
-Mark all entries.
+Mark the current entry (with prefix, mark all entries).
 @item u
 Unmark the current entry (with prefix, unmark all entries).
 @item @key{DEL}