Added templates subfolder instructions for Godot >= 3 (#480)

* Added templates subfolder instructions for Godot >=3

development/compiling/compiling_for_uwp.rst

@@ -13,7 +13,7 @@ Requirements
    :ref:`doc_compiling_for_windows` about the caveats of installing it
    and the various prompts.
 -  Windows 10 SDK (can be selected in Visual Studio installation).
--  `ANGLE source <https://github.com/Microsoft/angle>`__. Use the 
+-  `ANGLE source <https://github.com/Microsoft/angle>`__. Use the
    ``ms_master`` (default) branch. Keep it in a path without spaces to
    avoid problems.
 
@@ -71,8 +71,10 @@ Zip according to the target/architecture of the template::
     uwp_arm_debug.zip
     uwp_arm_release.zip
 
-Move those templates to the ``templates`` folder in Godot settings path. If
-you don't want to replacet the templates, you can set the "Custom Package"
+Move those templates to the ``[versionstring]\templates`` folder in Godot
+settings path, where `versionstring` is the version of Godot you have compiled
+the export templates for - e.g. `3.0.alpha` for the alpha version of Godot 3.
+If you don't want to replace the templates, you can set the "Custom Package"
 property in the export window.
 
 Running UWP apps with Visual Studio
@@ -96,7 +98,7 @@ Create a new Windows App project using the "App for OpenGL ES
 (Windows Unversal)" project template, which can be found under the
 ``Visual C++/Windows/Universal`` category.
 
-This is a base project with the ANGLE dependencies already set up. However, by 
+This is a base project with the ANGLE dependencies already set up. However, by
 default it picks the debug version of the DLLs which usually have a very poor
 performance. So in the "Binaries" filter, click in each of the DLLs there
 and in the "Properties" window and change the relative path from