ubi: block: Fix typos in comments

Various spelling mistakes in comments.
Detected with the help of Coccinelle.
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Signed-off-by: Richard Weinberger <richard@nod.at>

drivers/mtd/ubi/block.c

@@ -441,7 +441,7 @@ int ubiblock_create(struct ubi_volume_info *vi)
 
 	/*
 	 * Create one workqueue per volume (per registered block device).
-	 * Rembember workqueues are cheap, they're not threads.
+	 * Remember workqueues are cheap, they're not threads.
 	 */
 	dev->wq = alloc_workqueue("%s", 0, 0, gd->disk_name);
 	if (!dev->wq) {