Merge pull request #25 from csmoore/patch-1

Update wiki link

Framework/CustomStyling/ReadMe.md

@@ -37,7 +37,7 @@ Visual Studio:         2015
 
 ## How to use the sample
 <!-- TODO: Explain how this sample can be used. To use images in this section, create the image file in your sample project's screenshots folder. Use relative url to link to this image using this syntax: ![My sample Image](FacePage/SampleImage.png) -->
- New at 1.4, ArcGIS Pro supports a Light theme, Dark theme, and a variant of the Dark theme for use with High Contrast. Developers who want their Add-ins to blend in with Pro must likewise style their Add-in UIs to provide a Light and Dark themeing. In most cases, developers need only apply 'ESRI' styles to their UserControl content (refer to the ProGuide at [ProGuide: Styling UI Components](https://github.com/ArcGIS/arcgis-pro-sdk/wiki/ProGuide-Styling-UI-Components). However, there may be situations where you need to derive your own styles and have them switch between a custom Light and Dark mode to mirror the current theme being applied to Pro. This sample shows you how.    
+ New at 1.4, ArcGIS Pro supports a Light theme, Dark theme, and a variant of the Dark theme for use with High Contrast. Developers who want their Add-ins to blend in with Pro must likewise style their Add-in UIs to provide a Light and Dark themeing. In most cases, developers need only apply 'ESRI' styles to their UserControl content (refer to the ProGuide at [ProGuide Styling Guide](https://github.com/Esri/arcgis-pro-sdk/wiki/proguide-style-guide)). However, there may be situations where you need to derive your own styles and have them switch between a custom Light and Dark mode to mirror the current theme being applied to Pro. This sample shows you how.    
  The sample contains a custom UserControl as well as a custom Light and Dark theme that is applied at runtime in conjunction with the Light or Dark theme applied to Pro.    
  Steps: