multi: fix several typos in godoc comments

lnwallet/btcwallet/config.go

@@ -39,11 +39,11 @@ var (
 	walletDbName = "lnwallet.db"
 )
 
-// Config is a struct which houses configuration paramters which modify the
+// Config is a struct which houses configuration parameters which modify the
 // instance of BtcWallet generated by the New() function.
 type Config struct {
 	// DataDir is the name of the directory where the wallet's persistent
-	// state should be sotred.
+	// state should be stored.
 	DataDir string
 
 	// LogDir is the name of the directory which should be used to store