mm: compaction: Update try_to_compact_pages()kerneldoc comment

Parameters were added without documentation, tut tut.

Change-Id: I1355906b3a3a6e3319a0fedc8ba28c3327a0c8f2
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Git-commit: 661c4cb9b829110cb68c18ea05a56be39f75a4d2
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>