Nowadays, man-pages has an associated mailing list.  Mention that list
in MAINTAINERS.
Signed-off-by: NMichael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>