Update index.md

HfT Building Models/Sketchup/Dastageeri/index.md

 Note:
 
-All files are for
+All files in the archive are for
 
     Sketchup 2015 and above
     
-All files are modeled in LoD3
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+All files are modeled in LoD3 with layers for CityGML surface types
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