mm/page_isolation: fix typo: "paes" -> "pages"

Fix typo in comment.

Link: http://lkml.kernel.org/r/1474788764-5774-1-git-send-email-ysxie@foxmail.com
Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/page_isolation.c

@@ -55,7 +55,7 @@ static int set_migratetype_isolate(struct page *page,
 		ret = 0;
 
 	/*
-	 * immobile means "not-on-lru" paes. If immobile is larger than
+	 * immobile means "not-on-lru" pages. If immobile is larger than
 	 * removable-by-driver pages reported by notifier, we'll fail.
 	 */