[SCSI] libfcoe: fix wrong comment in fcoe_transport_detach

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

Reported-by: Frank Zhang <frank_1.zhang@intel.com>
Signed-off-by: Yi Zou <yi.zou@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

drivers/scsi/fcoe/fcoe_transport.c

@@ -335,7 +335,7 @@ out_attach:
 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