Documentation: networking: arcnet: drop doubled word

Drop the doubled word "to".

Signed-off-by: Randy Dunlap <[e-mail]>
Cc: Jonathan Corbet <[e-mail]>
Cc: [e-mail]
Cc: "David S. Miller" <[e-mail]>
Cc: Jakub Kicinski <[e-mail]>
Cc: [e-mail]
Signed-off-by: David S. Miller <[e-mail]>

Documentation/networking/arcnet.rst

···
 	ifconfig arc0 insight
 	route add insight arc0
 	route add freedom arc0	/* I would use the subnet here (like I said
-					to to in "single protocol" above),
+					to in "single protocol" above),
 					but the rest of the subnet
 					unfortunately lies across the PPP
 					link on freedom, which confuses