Update viam-applications.md

Author: npentrel

docs/operate/control/viam-applications.md

@@ -54,7 +54,8 @@ const machineCookieKey = window.location.pathname.split("/")[2];
 } = JSON.parse(Cookies.get(machineCookieKey)!));
 ```
 
-For developing your application on localhost, run the following command which will proxy your local app to a machine for testing:
+For developing your application on localhost, run the following command which will proxy your local app.
+The command will open a browser window and navigate to `http://localhost:8000/machine/<machineHostname>` for the machine provided with --machine-id.
 
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