updated the sticker sheet page

Author: dcaiced0

design/user-interface/sticker-sheet.md

@@ -5,7 +5,7 @@ This sticker sheet will cover the different UI surfaces available to plugins. It
 
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-**Plugin UI kits**
+**UI kits**
 
 ![MacOS UI Kit](../ux-images/Plugin-MacOS-UIKit.png)
 ![Windows UI Kit](../ux-images/Plugin-UWP-UIKit.png)