added the TOC.

Author: SweathaBharathi

winui-toc.html

@@ -321,6 +321,7 @@
 			<li><a href="/winui/DataGrid/Merge-Cells">Merge Cells</a></li>
 			<li><a href="/winui/DataGrid/Unbound-Rows">Unbound Rows</a></li>
 			<li><a href="/winui/DataGrid/Unbound-Column">Unbound Column</a></li>
+            <li><a href="/winui/DataGrid/Printing">Printing</a></li>
 			<li><a href="/winui/DataGrid/Performance">Performance</a></li>
 			<li><a href="/winui/DataGrid/ToolTip">ToolTip</a></li>
 			<li><a href="/winui/DataGrid/Context-Flyout">Context Flyout</a></li>