Update the Scene Understanding sample scene to show SU package is available

Author: MaxWang-MS

Assets/MRTK/Examples/Experimental/SceneUnderstanding/Scenes/SceneUnderstandingExample.unity

@@ -4926,22 +4926,22 @@ PrefabInstance:
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@@ -4961,10 +4961,8 @@ PrefabInstance:
 
         <size=24><b>Important - Required packages</b></size>
 
-        Use Mixed Reality Feature Tool to get the Scene Understanding package. The
-        Scene Understanding package may not be available at MRTK 2.6 launch time but
-        will be released soon after. Please check issue #9402 on the MRTK-Unity GitHub
-        repository for updates on its availability.'
+        Use Mixed Reality Feature Tool to get the now available Scene Understanding
+        package.'
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