cleaning up AMD comment.

underscore.js

@@ -57,10 +57,7 @@
     }
     exports._ = _;
   } else if (typeof define === 'function' && define.amd) {
-    // Register as a module with AMD. Use a named module since underscore
+    // Register as a named module with AMD.
-    // can be used in optimization schemes that do not understand anonymous
-    // modules, and the if it is used on a page with an AMD loader, a load
-    // error could occur.
     define('underscore', function() {
       return _;
     });