Change to use dev mode (#207)

* Change to use dev mode

* Update the Current Year to README.adoc

---------

Co-authored-by: Ruilin-Ma <[email protected]>

Author: gkwan-ibm

README.adoc

@@ -1,4 +1,4 @@
-// Copyright (c) 2019, 2022 IBM Corporation and others.
+// Copyright (c) 2019, 2023 IBM Corporation and others.
 // Licensed under Creative Commons Attribution-NoDerivatives
 // 4.0 International (CC BY-ND 4.0)
 //   https://creativecommons.org/licenses/by-nd/4.0/
@@ -331,7 +331,7 @@ ifdef::cloud-hosted[]
 Whenever you change and build your Angular implementation, the changes are automatically reflected at the URL for the launched application.
 endif::[]
 
-When you are done checking the application root, exit development mode by pressing `CTRL+C` in the command-line session where you ran the server, or by typing `q` and then pressing the `enter/return` key.
+When you are done checking the application root, exit dev mode by pressing `CTRL+C` in the command-line session where you ran the server, or by typing `q` and then pressing the `enter/return` key.
 
 Although the Angular application that this guide shows you how to build is simple, when you build more complex Angular applications, testing becomes a crucial part of your development lifecycle. If you need to write test cases, follow the official unit testing and end-to-end testing documentation on the https://angular.io/guide/testing[official Angular page^].