scsi: lpfc: Fix nvme first burst module parameter description

modinfo for lpfc_nvme_enable_fb is incorrect. FirstBurst on lpfc target is
not fully supported.

Update the attribute description

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>