Update comments in core lib showing proper factory syntax.

corelib/src/implementation/queue.dart

Index: corelib/src/implementation/queue.dart
===================================================================
--- corelib/src/implementation/queue.dart	(revision 1677)
+++ corelib/src/implementation/queue.dart	(working copy)
@@ -102,9 +102,9 @@
     _sentinel = new _DoubleLinkedQueueEntrySentinel<E>();
   }
 
-  // See bug 5257789.
-  factory DoubleLinkedQueue/* <E> */.from(Iterable/* <E> */ other) {
-    Queue/* <E> */ list = new DoubleLinkedQueue();
+  // See issue 417. Works in the vm, fails in dartc and frog.
+  factory DoubleLinkedQueue/*<E>*/.from(Iterable/*<E>*/ other) {
+    Queue/*<E>*/ list = new DoubleLinkedQueue();
     for (final e in other) {
       list.addLast(e);
     }