block: fix comment typo in submit_bio of block-core.c.

This patch fix a comment typo in block-core.c.
Signed-off-by: Ping-Xiang Chen <p.x.chen@uci.edu>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220914074237.31621-1-p.x.chen@uci.eduSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-core.c

@@ -810,7 +810,7 @@ EXPORT_SYMBOL(submit_bio_noacct);
  *
  * The success/failure status of the request, along with notification of
  * completion, is delivered asynchronously through the ->bi_end_io() callback
- * in @bio.  The bio must NOT be touched by thecaller until ->bi_end_io() has
+ * in @bio.  The bio must NOT be touched by the caller until ->bi_end_io() has
  * been called.
  */
 void submit_bio(struct bio *bio)