docs(oauth2-browser): make demo directions for creating an applicatio…

…n more specific

AFFECTS PACKAGES:
@esri/arcgis-rest-demo-vanilla

demos/oauth2-browser/README.md

@@ -5,7 +5,7 @@ the `arcgis-rest-js` libraries.
 
 ## Running this demo
 1. Like all the other demo apps, run `npm run bootstrap` in the root directory.
-1. Register a new application using [https://developers.arcgis.com](https://developers.arcgis.com).
+1. Register a new application using https://developers.arcgis.com/applications/new (you will be prompted to sign in or create a free account first).
 1. Add a redirect URL of `http://localhost:8080` to your new app.
 1. Either copy the `config.js.template` file and rename it to `config.js` with your own ClientID or supply it in the prompt when the app is launched.
 1. Run `npm start` to spin up the development server.