ixgbe: drop adapter from ixgbe_fso call documentation

The adapter structure was removed from the call so it can be dropped from
the ixgbe_fso documentation.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c

@@ -440,7 +440,6 @@ ddp_out:
 
 /**
  * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
- * @adapter: ixgbe adapter
  * @tx_ring: tx desc ring
  * @skb: associated skb
  * @tx_flags: tx flags