GLTFLoader: Remove 'experimental' note on KHR_texture_basisu.

docs/examples/en/loaders/GLTFLoader.html

@@ -34,7 +34,7 @@
 			<li>KHR_materials_unlit</li>
 			<li>KHR_mesh_quantization</li>
 			<li>KHR_lights_punctual<sup>1</sup></li>
-			<li>KHR_texture_basisu <i>(experimental)</i></li>
+			<li>KHR_texture_basisu</li>
 			<li>KHR_texture_transform<sup>2</sup></li>
 			<li>EXT_texture_webp</li>
 			<li>EXT_meshopt_compression</li>

docs/examples/zh/loaders/GLTFLoader.html

@@ -32,7 +32,7 @@
 			<li>KHR_materials_unlit</li>
 			<li>KHR_mesh_quantization</li>
 			<li>KHR_lights_punctual<sup>1</sup></li>
-			<li>KHR_texture_basisu <i>(experimental)</i></li>
+			<li>KHR_texture_basisu</li>
 			<li>KHR_texture_transform<sup>2</sup></li>
 			<li>EXT_texture_webp</li>
 			<li>EXT_meshopt_compression</li>