added a table

Author: dcaiced0

design/index.md

@@ -15,7 +15,7 @@ Learn more about the types of Adobe XD plugins you can build.
 ![Panels and modals](ux-images/Design-xd-plugins-1.png)
 
 | **Plugins Panel (Non-Blocking UI)**   | **Modal Dialog (Blocking UI)**   |
-|-------------------------------------|--------------------------------|
+|---------------------------------------|----------------------------------|
 | This surface is best used when the user should have access to the canvas while using the plugin.   | This surface is best used when the plugin needs to run an action and the user shouldn’t modify or change selection of objects on the canvas.   |
 
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