drivers/net/ethernet: Fix non-kernel-doc comments with kernel-doc start markers

Convert doxygen (or similar) formatted comments to kernel-doc or
unformatted comment.  Delete a few that are content-free.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/broadcom/cnic.c b/drivers/net/ethernet/broadcom/cnic.c
index 22ad7b6..650c545 100644
--- a/drivers/net/ethernet/broadcom/cnic.c
+++ b/drivers/net/ethernet/broadcom/cnic.c
@@ -5542,9 +5542,7 @@
 	rcu_read_unlock();
 }
 
-/**
- * netdev event handler
- */
+/* netdev event handler */
 static int cnic_netdev_event(struct notifier_block *this, unsigned long event,
 							 void *ptr)
 {