ethernet/natsemi: fix repeated words in comments

Delete the redundant word 'in'.
Signed-off-by: NJilin Yuan <yuanjilin@cdjrlc.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/natsemi/natsemi.c

@@ -158,7 +158,7 @@ MODULE_PARM_DESC(full_duplex, "DP8381x full duplex setting(s) (1)");
 I. Board Compatibility
 
 This driver is designed for National Semiconductor DP83815 PCI Ethernet NIC.
-It also works with other chips in in the DP83810 series.
+It also works with other chips in the DP83810 series.
 
 II. Board-specific settings