Add reason why default DPI setting is used

Author: gowtham2712

dotnet/InkRecognition/uwp-app/cs/Services/Ink/InkRecognizer.cs

@@ -17,7 +17,7 @@ public class InkRecognizer
 
         HttpManager httpManager;
 
-        // Default DPI setting
+        // Default DPI setting to use when device displayInfo is not set
         float dpiX = 96.0f;
         float dpiY = 96.0f;