multi: fix sever/server typos

Fixed sever/server typos and regenerated rpc.pb.go

sample-lnd.conf

@@ -313,7 +313,7 @@ litecoin.node=ltcd
 ; tor.socks=9050
 
 ; The DNS server as IP:PORT that Tor will use for SRV queries - NOTE must have
-; TCP resolution enabled. The current active DNS sever for Testnet listening is
+; TCP resolution enabled. The current active DNS server for Testnet listening is
 ; nodes.lightning.directory
 ; tor.dns=nodes.lightning.directory