Remove md_widget_color docs

documentation/CORE.md

@@ -619,21 +619,3 @@ using attributes in your app's theme.
 See the "Custom Theme" example in the sample project (open the overflow menu for the theme switcher).
 
 <img src="https://raw.githubusercontent.com/afollestad/material-dialogs/master/art/customtheme.png" width="250px" />
-
-### Widget Color
-
-By default, widgets like CheckBoxes and RadioButtons use your theme's accent color when they are 
-checked. You can override that to use whatever color you want. This applies to checkbox prompts, 
-single and multiple choice lists, etc. but will not automatically apply to widgets in your own 
-custom views.
-
-```xml
-<style name="AppTheme.Custom" parent="Theme.AppCompat">
-
-  <item name="md_widget_color">@color/your_color</item>
-  
-  <!-- Generally this should be avoided, checkboxes should be white or gray when unchecked -->
-  <item name="md_widget_color_unchecked">@color/your_color</item>
-    
-</style>
-```