Fix formatting in drag-and-drop overview document

dotnet-desktop-guide/framework/wpf/advanced/drag-and-drop-overview.md

@@ -190,10 +190,10 @@ This topic provides an overview of drag-and-drop support in Windows Presentation
 - Processing the dropped data.  
 
 To specify that an element is a drop target, you set its <xref:System.Windows.UIElement.AllowDrop%2A> property to `true`. The drop target events will then be raised on the element so that you can handle them.
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 When a drop target is evaluated, a hit test is performed to identify if the cursor is over the element's visual. Some controls, such as the <xref:System.Windows.Controls.Canvas>, don't have a visual and can't be used as a drop target unless a visual is added. Set the `Canvas.Background` property to any color to create a visual that fills the `Canvas` with color. To keep the `Canvas` transparent but enable it as a drop target, set the `Background` property to `Transparent`.
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-During a drag-and-drop operation, the following sequence of events occurs on the drop target:  
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+During a drag-and-drop operation, the following sequence of events occurs on the drop target:
 
 1. <xref:System.Windows.DragDrop.DragEnter>