Docs: Improve WebGL2 guide.

docs/manual/en/introduction/How-to-use-WebGL2.html

@@ -111,7 +111,9 @@ var material = new THREE.ShaderMaterial( {
 		overview about what's already available in the latest version of three.js.
 		<ul>
 			<li>3D Textures</li>
+			<li>2D Texture Arrays</li>
 			<li>Multisampled Renderbuffers</li>
+			<li>Non-power of two (POT) textures work just the same as POT textures now. No resizing is required for best quality.</li>
 		</ul>
 
 	</p>