lncli: rename value to amt in addinvoice command

docs/grpc/javascript.md

@@ -91,7 +91,7 @@ call.on('data', function(invoice) {
 Now, create an invoice for your node at `localhost:10009`and send a payment to
 it from another node.
 ```bash
-$ lncli addinvoice --value=100
+$ lncli addinvoice --amt=100
 {
 	"r_hash": <RHASH>,
 	"pay_req": <PAYMENT_REQUEST>