Fix directory name in readme for HeapsOnHLExample.
Fix directory name in readme for HeapsOnHLExample.

TiVo/intellij-haxe,winmain/intellij-haxe,EricBishton/intellij-haxe,HaxeFoundation/intellij-haxe,eliasku/intellij-haxe,winmain/intellij-haxe,eliasku/intellij-haxe,EricBishton/intellij-haxe,eliasku/intellij-haxe,EricBishton/intellij-haxe,HaxeFoundation/intellij-haxe,HaxeFoundation/intellij-haxe,winmain/intellij-haxe,TiVo/intellij-haxe,TiVo/intellij-haxe