Changed init() function to comment

See here for further discussion:

https://github.com/mrdoob/three.js/issues/11421

docs/manual/introduction/WebGL-compatibility-check.html

@@ -21,7 +21,7 @@
 
 <code>
 if (Detector.webgl) {
-    init();
+    // Initiate function or other initializations here
     animate();
 } else {
     var warning = Detector.getWebGLErrorMessage();