bcache: bset: Fix comment typos

Remove the redundant word `by`, correct the typo `creaated`.

CC: Kent Overstreet <kent.overstreet@gmail.com>
CC: linux-bcache@vger.kernel.org
Signed-off-by: Jules Maselbas <jmaselbas@kalray.eu>
Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20220919161647.81238-4-colyli@suse.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/md/bcache/bset.c

@@ -1264,7 +1264,7 @@ static void __btree_sort(struct btree_keys *b, struct btree_iter *iter,
 		 *
 		 * Don't worry event 'out' is allocated from mempool, it can
 		 * still be swapped here. Because state->pool is a page mempool
-		 * creaated by by mempool_init_page_pool(), which allocates
+		 * created by mempool_init_page_pool(), which allocates
 		 * pages by alloc_pages() indeed.
 		 */