mm/page_alloc.c: clean up comment

Signed-off-by: Yaowei Bai <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

mm/page_alloc.c

···
 			 * value here.
 			 *
 			 * The WMARK_HIGH-WMARK_LOW and (WMARK_LOW-WMARK_MIN)
-			 * deltas controls asynch page reclaim, and so should
+			 * deltas control asynch page reclaim, and so should
 			 * not be capped for highmem.
 			 */
 			unsigned long min_pages;