docs: update JS section of abci-cli.md (#3747)

docs/app-dev/abci-cli.md

@@ -326,10 +326,18 @@ application easily in any language.
 We have implemented the counter in a number of languages [see the
 example directory](https://github.com/tendermint/tendermint/tree/develop/abci/example).
 
-To run the Node JS version, `cd` to `example/js` and run
+To run the Node.js version, fist download & install [the Javascript ABCI server](https://github.com/tendermint/js-abci):
 
 ```
-node app.js
+git clone https://github.com/tendermint/js-abci.git
+cd js-abci
+npm install abci
+```
+
+Now you can start the app:
+
+```bash
+node example/counter.js
 ```
 
 (you'll have to kill the other counter application process). In another