nvmet-fc: update function documentation

Add minimum description of the hosthandle parameter for
nvmet_fc_rcv_ls_req() so that we can get rid of the following warning.

drivers/nvme//target/fc.c:2009: warning: Function parameter or member 'hosthandle' not described in 'nvmet_fc_rcv_ls_req
Signed-off-by: NChaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: NJames Smart <jsmart2021@gmail.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

drivers/nvme/target/fc.c

@@ -1996,6 +1996,7 @@ nvmet_fc_handle_ls_rqst_work(struct work_struct *work)
  *
  * @target_port: pointer to the (registered) target port the LS was
  *              received on.
+ * @hosthandle: pointer to the host specific data, gets stored in iod.
  * @lsrsp:      pointer to a lsrsp structure to be used to reference
  *              the exchange corresponding to the LS.
  * @lsreqbuf:   pointer to the buffer containing the LS Request