Fix typo in comment: mirorr -> mirror

examples/webgl_mirror.html

@@ -86,7 +86,7 @@
 
 				var planeGeo = new THREE.PlaneBufferGeometry( 100.1, 100.1 );
 				
-				// MIRORR planes
+				// MIRROR planes
 				groundMirror = new THREE.Mirror( renderer, camera, { clipBias: 0.003, textureWidth: WIDTH, textureHeight: HEIGHT, color: 0x777777 } );
 				
 				var mirrorMesh = new THREE.Mesh( planeGeo, groundMirror.material );