Updated the proper file name

Updated the proper file name

Author: abineshPalanisamy

MAUI/SmartDataGrid/appearance -.md MAUI/SmartDataGrid/appearance.mdMAUI/SmartDataGrid/appearance -.md renamed to MAUI/SmartDataGrid/appearance.md

@@ -1442,8 +1442,8 @@
                     <li><a href="/maui/SmartDataGrid/overview">Overview</a></li>
                     <li><a href="/maui/SmartDataGrid/getting-started">Getting Started</a></li>
                     <li><a href="/maui/SmartDataGrid/ai-powered-features">AI Powered Features</a></li>
-                    <li><a href="/maui/SmartDataGrid/Appearance">Appearance</a></li>
-                    <li><a href="/maui/SmartDataGrid/Customization">Customization</a></li>
+                    <li><a href="/maui/SmartDataGrid/appearance">Appearance</a></li>
+                    <li><a href="/maui/SmartDataGrid/customization">Customization</a></li>
                 </ul>
             </li>
             <li>