message: fix(docs): fixed angular-cli docs install guide
diff: #### Installing angular-cli
  -*Important*: please check `angular-cli` version, it should be => "1.0.0-beta.24"
  -
  *Note*: you can skip this part if you already have application generated by `ng-cli` and webpack
  ```bash
  -npm i -g angular-cli
  +npm i -g @angular/cli
  ng new my-app
  cd my-app
  ng serve
  