Fix Fade doc link and extra comma

Author: michael-hawker

Microsoft.Toolkit.Uwp.SampleApp/SamplePages/samples.json

@@ -493,13 +493,13 @@
       },
       {
         "Name": "Fade",
-        "Subcategory": "Effect",
+        "Subcategory": "Behavior",
         "About": "Opacity of XAML elements using composition animations",
         "CodeUrl": "https://github.com/windows-toolkit/WindowsCommunityToolkit/tree/master/Microsoft.Toolkit.Uwp.UI.Animations/Behaviors",
         "CodeFile": "/SamplePages/Animations/Effects/FadeBehaviorCode.bind",
         "XamlCodeFile": "/SamplePages/Animations/Effects/FadeBehaviorXaml.bind",
         "Icon": "/SamplePages/Animations/Effects/FadeBehavior.png",
-        "DocumentationUrl": "https://raw.githubusercontent.com/MicrosoftDocs/WindowsCommunityToolkitDocs/master/docs/animations/Fade.md"
+        "DocumentationUrl": "https://raw.githubusercontent.com/MicrosoftDocs/WindowsCommunityToolkitDocs/master/docs/animations/AnimationSet.md"
       },
       {
         "Name": "Scale",
@@ -1234,7 +1234,7 @@
         "CodeFile": "GazeTracingCode.bind",
         "Icon": "/SamplePages/GazeTracing/GazeTracing.png",
         "ApiCheck": "Windows.Devices.Input.Preview.GazeInputSourcePreview",
-        "DocumentationUrl" : "https://raw.githubusercontent.com/MicrosoftDocs/WindowsCommunityToolkitDocs/master/docs/gaze/GazeInteractionLibrary.md",
+        "DocumentationUrl" : "https://raw.githubusercontent.com/MicrosoftDocs/WindowsCommunityToolkitDocs/master/docs/gaze/GazeInteractionLibrary.md"
       }
     ]
   }