Merge pull request #4118 from dad72/patch-5

Fix the link to the doc

dist/gui/readme.md

@@ -1,7 +1,7 @@
 Babylon.js GUI module
 =====================
 
-For usage documentation please visit http://doc.babylonjs.com/overviews/gui
+For usage documentation please visit http://doc.babylonjs.com/how_to/gui
 
 # Installation instructions