Update build-a-hello-world-web-part.md

There is no support for running the app from Visual Studio Code, Ctrl+Shift+B just builds the project

Author: pesq

docs/spfx/web-parts/get-started/build-a-hello-world-web-part.md

@@ -93,7 +93,7 @@ SharePoint client-side development tools use [gulp](http://gulpjs.com/) as the t
 
 If you are new to gulp, you can read [Using Gulp](http://docs.asp.net/en/latest/client-side/using-gulp.html) which describes using gulp with Visual Studio in conjunction with building ASP.NET 5 projects.
 
-Visual Studio Code provides built-in support for gulp and other task runners. Choose **Ctrl+Shift+B** on Windows or **Cmd+Shift+B** on Mac to debug and preview your web part. 
+Visual Studio Code provides built-in support for gulp and other task runners. Choose **Ctrl+Shift+B** on Windows or **Cmd+Shift+B** on Mac to build your project. 
 
 ### SharePoint Workbench
 SharePoint Workbench is a developer design surface that enables you to quickly preview and test web parts without deploying them in SharePoint. SharePoint Workbench includes the client-side page and the client-side canvas in which you can add, delete and test your web parts in development.