scsi: target: Documentation: Correct spelling

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

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Randy Dunlap <[e-mail]>
Cc: "Martin K. Petersen" <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: Jonathan Corbet <[e-mail]>
Cc: [e-mail]
Signed-off-by: Martin K. Petersen <[e-mail]>

Documentation/target/tcmu-design.rst

···
 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