Added new variations example to list.

examples/index.html

@@ -317,6 +317,7 @@
 				"webgl_materials_variations_lambert",
 				"webgl_materials_variations_phong",
 				"webgl_materials_variations_physical",
+				"webgl_materials_variations_physical2",
 				"webgl_materials_video",
 				"webgl_materials_wireframe",
 				"webgl_mirror",