mm: fix typos and grammar error in comments

We moves tha -> We move that in mm/swap.c
statments -> statements in include/linux/mm.h

Link: https://lkml.kernel.org/r/20210509063444.GA24745@hyeyoo
Signed-off-by: Hyeonggon Yoo <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/linux/mm.h

···
 /* This function must be updated when the size of struct page grows above 80
  * or reduces below 56. The idea that compiler optimizes out switch()
  * statement, and only leaves move/store instructions. Also the compiler can
- * combine write statments if they are both assignments and can be reordered,
+ * combine write statements if they are both assignments and can be reordered,
  * this can result in several of the writes here being dropped.
  */
 #define	mm_zero_struct_page(pp) __mm_zero_struct_page(pp)

mm/swap.c

···
 	} else {
 		/*
 		 * The page's writeback ends up during pagevec
-		 * We moves tha page into tail of inactive.
+		 * We move that page into tail of inactive.
 		 */
 		add_page_to_lru_list_tail(page, lruvec);
 		__count_vm_events(PGROTATED, nr_pages);