[SCSI] libfcoe: fix wrong comment in fcoe_transport_detach

fix typo of '_attach' -> '_detach' in the comment.

Reported-by: Frank Zhang <[e-mail]>
Signed-off-by: Yi Zou <[e-mail]>
Tested-by: Ross Brattain <[e-mail]>
Signed-off-by: Robert Love <[e-mail]>
Signed-off-by: James Bottomley <[e-mail]>

drivers/scsi/fcoe/fcoe_transport.c

···
 EXPORT_SYMBOL(fcoe_transport_attach);
 
 /**
- * fcoe_transport_attach - Detaches an FCoE transport
+ * fcoe_transport_detach - Detaches an FCoE transport
  * @ft: The fcoe transport to be attached
  *
  * Returns : 0 for success