scsi: target: Documentation: Correct spelling

Correct spelling problems for Documentation/target/ as reported by
codespell.

Link: https://lore.kernel.org/r/20230127064005.1558-29-rdunlap@infradead.orgSigned-off-by: NRandy Dunlap <rdunlap@infradead.org>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org
Cc: target-devel@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Documentation/target/tcmu-design.rst

@@ -171,7 +171,7 @@ When the opcode is CMD, the entry in the command ring is a struct
 tcmu_cmd_entry. Userspace finds the SCSI CDB (Command Data Block) via
 tcmu_cmd_entry.req.cdb_off. This is an offset from the start of the
 overall shared memory region, not the entry. The data in/out buffers
-are accessible via tht req.iov[] array. iov_cnt contains the number of
+are accessible via the req.iov[] array. iov_cnt contains the number of
 entries in iov[] needed to describe either the Data-In or Data-Out
 buffers. For bidirectional commands, iov_cnt specifies how many iovec
 entries cover the Data-Out area, and iov_bidi_cnt specifies how many