Add spacing properties to docs

Author: skendrot

docs/controls/StaggeredPanel.md

@@ -41,6 +41,8 @@ The [StaggeredPanel](https://docs.microsoft.com/en-us/dotnet/api/microsoft.toolk
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 | DesiredColumnWidth | double | The desired width of each column. The width of columns can exceed the DesiredColumnWidth if the HorizontalAlignment is set to Stretch. |
 | Padding | Thickness | The dimensions of the space between the edge and its child as a Thickness value. Thickness is a structure that stores dimension values using pixel measures. |
+| ColumnSpacing | double  | Gets or sets the distance between columns |
+| RowSpacing | double  | Gets or sets the vertical distance between items |
 
 ## Sample Project
 

docs/controls/WrapPanel.md

@@ -35,6 +35,8 @@ When the Orientation is Vertical, HorizontalSpacing adds uniform spacing between
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 | Orientation | Orientation | Gets or sets the orientation of the WrapPanel, Horizontal or vertical means that child controls will be added horizontally until the width of the panel can't fit more control then a new row is added to fit new horizontal added child controls, vertical means that child will be added vertically until the height of the panel is recieved then a new column is added |
 | Padding | Thickness  | Gets or sets the distance between the border and its child object |
+| VerticalSpacing | double  | Gets or sets the vertical distance between items |
+| HorizontalSpacing | double  | Gets or sets the horizontal distance between items |
 
 ## Examples