update reference doc

Author: simutaroman

src/dotnet/Blazor3D.Web/Blazor3D.Web/wwwroot/reference/Blazor3D.Viewers.Viewer.html

@@ -159,6 +159,15 @@ <h3 class="fontlight">Methods</h3>
 <table class="table table-bordered">
 <tr>
 <td>
+<strong>UpdateScene()</strong>
+</td>
+<td>
+<div>Updates scene changes.</div>
+<div><p><strong>Returns:</strong> Task</p></div>
+</td>
+</tr>
+<tr>
+<td>
 <strong>SetCameraPositionAsync(Vector3, Vector3)</strong>
 </td>
 <td>