Fixed documentation URL

Author: ryanmayeda

README

@@ -11,6 +11,6 @@ Unreal engine as well as several unreal related options in Maya.
 For more information how to use the unreal engine, please see the support
 documentation:
 
-https://docs.unrealengine.com/en-us/Editor/Content/Using-Unreal-Engine-with-Autodesk-Shotgun
+https://docs.unrealengine.com/en-US/Engine/Content/UsingUnrealEnginewithAutodeskShotgun/index.html
 
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