md/raid1: fix a trivial typo in comments

raid1.c: fix a trivial typo in comments of freeze_array().

Cc: Jack Wang <[e-mail]>
Cc: Guoqing Jiang <[e-mail]>
Cc: John Stoffel <[e-mail]>
Acked-by: Coly Li <[e-mail]>
Signed-off-by: Zhilong Liu <[e-mail]>
Signed-off-by: Shaohua Li <[e-mail]>

drivers/md/raid1.c

···
 static void freeze_array(struct r1conf *conf, int extra)
 {
 	/* Stop sync I/O and normal I/O and wait for everything to
-	 * go quite.
+	 * go quiet.
 	 * This is called in two situations:
 	 * 1) management command handlers (reshape, remove disk, quiesce).
 	 * 2) one normal I/O request failed.