Docs: Improve `GLTFExporter` page. (#29809)

docs/examples/en/exporters/GLTFExporter.html

@@ -52,6 +52,8 @@
 			<li>KHR_materials_volume</li>
 			<li>KHR_mesh_quantization</li>
 			<li>KHR_texture_transform</li>
+			<li>EXT_materials_bump</li>
+			<li>EXT_mesh_gpu_instancing</li>
 		</ul>
 
 		<p>

docs/examples/zh/exporters/GLTFExporter.html

@@ -50,6 +50,8 @@
 		<li>KHR_materials_volume</li>
 		<li>KHR_mesh_quantization</li>
 		<li>KHR_texture_transform</li>
+		<li>EXT_materials_bump</li>
+		<li>EXT_mesh_gpu_instancing</li>
 	</ul>
 
 	<p>