mlock: replace stale comments in munlock_vma_page()

Cleanup stale comments on munlock_vma_page().

Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Acked-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>