Update the Angular CLI installation command (#3214)

Author: frankfullstack

public/docs/ts/latest/cli-quickstart.jade

@@ -40,7 +40,7 @@ h2#devenv Step 1. Set up the Development Environment
   Then **install the [Angular-CLI](https://github.com/angular/angular-cli)** globally.
 
 code-example(language="sh" class="code-shell").
-  npm install -g angular-cli
+  npm install -g @angular/cli
 
 .l-main-section
 h2#create-project Step 2. Create a new project