Update comments in core lib showing proper factory syntax.

corelib/src/implementation/hash_map_set.dart

Index: corelib/src/implementation/hash_map_set.dart
===================================================================
--- corelib/src/implementation/hash_map_set.dart	(revision 1677)
+++ corelib/src/implementation/hash_map_set.dart	(working copy)
@@ -50,10 +50,10 @@
     _values = new List<V>(_INITIAL_CAPACITY);
   }
 
-  // See bug 5257789. Works in the vm, fails in dartc and frog.
-  factory HashMapImplementation/* <K, V> */.from(Map/* <K, V> */other) {
-    Map/* <K, V> */ result = new HashMapImplementation/* <K, V> */();
-    other.forEach((/* K */ key, /* V */ value) { result[key] = value; });
+  // See issue 417. Works in the vm, fails in dartc and frog.
+  factory HashMapImplementation/*<K, V>*/.from(Map/*<K, V>*/ other) {
+    Map/*<K, V>*/ result = new HashMapImplementation/*<K, V>*/();
+    other.forEach((/*K*/ key, /*V*/ value) { result[key] = value; });
     return result;
   }
 
@@ -275,9 +275,9 @@
     _backingMap = new HashMapImplementation<E, E>();
   }
 
-  // See bug 5257789.
-  factory HashSetImplementation/* <E> */.from(Iterable/* <E> */ other) {
-    Set/* <E> */ set = new HashSetImplementation/* <E> */();
+  // See issue 417. Works in the vm, fails in dartc and frog.
+  factory HashSetImplementation/*<E>*/.from(Iterable/*<E>*/ other) {
+    Set/*<E>*/ set = new HashSetImplementation/*<E>*/();
     for (final e in other) {
       set.add(e);
     }