e1000e: Add @adapter description to kdoc

Provide a description for the kernel doc of the @adapter
of e1000e_trigger_lsc()
Signed-off-by: Baozhu Ni <nibaozhu@yeah.net>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/e1000e/netdev.c

@@ -4198,7 +4198,7 @@ void e1000e_reset(struct e1000_adapter *adapter)
 
 /**
  * e1000e_trigger_lsc - trigger an LSC interrupt
- * @adapter: 
+ * @adapter: board private structure
  *
  * Fire a link status change interrupt to start the watchdog.
  **/