i40e: fix i40e_phy_type_to_ethtool function header

The function header erroneously listed 'phy_types' as a parameter.  The
correct parameter is 'pf'.
Signed-off-by: Alan Brady <alan.brady@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_ethtool.c

@@ -253,7 +253,7 @@ static void i40e_partition_setting_complaint(struct i40e_pf *pf)
 
 /**
  * i40e_phy_type_to_ethtool - convert the phy_types to ethtool link modes
- * @phy_types: PHY types to convert
+ * @pf: PF struct with phy_types
  * @supported: pointer to the ethtool supported variable to fill in
  * @advertising: pointer to the ethtool advertising variable to fill in
  *