Updated BusyIndicator (markdown)

BusyIndicator.md

@@ -4,7 +4,7 @@ Derives from ContentControl
 BusyIndicator makes it easy to let the user know when an application is busy.  Simply wrap the relevant content in an instance of the BusyIndicator control and toggle its IsBusy property to True during any long-running process.
 ![](BusyIndicator_busyindicator.jpg)
 
-## Usage
+### Usage
 
 **Add namespace:**
 ```
@@ -58,7 +58,7 @@ xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
 </xctk:BusyIndicator>
 ```
 
-## Properties
+### Properties
 | Property | Description |
 | --- | --- |
 | BusyContent |  Gets or sets the busy content to display to the user. |