Update description text

Author: keveleigh

Assets/MRTK/Tools/RuntimeTools/Tools/InputFeatureUsageTool/InputFeatureUsageTool.unity

@@ -200,7 +200,7 @@ PrefabInstance:
         Controls</b></size>
 
         The panels display the current state of all
-        reported InputFeatureUsages on the first two detected Unity input sources.
+        reported InputFeatureUsages on all detected Unity input sources.
 
 
         <size=24><b>Active
@@ -212,6 +212,16 @@ PrefabInstance:
 
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