Fix documentation for identity sets/maps.

sdk/lib/collection/linked_hash_set.dart

Index: sdk/lib/collection/linked_hash_set.dart
diff --git a/sdk/lib/collection/linked_hash_set.dart b/sdk/lib/collection/linked_hash_set.dart
index 3bc170ffa52c4111ac80165b2d1364c4a4582561..2053251c16704c3e86e6c45d1b86910f5f34784c 100644
--- a/sdk/lib/collection/linked_hash_set.dart
+++ b/sdk/lib/collection/linked_hash_set.dart
@@ -83,8 +83,8 @@ abstract class LinkedHashSet<E> implements HashSet<E> {
    *
    * Effectively a shorthand for:
    *
-   *     new LinkedHashSet(equals: identical,
-   *                       hashCode: identityHashCode)
+   *     new LinkedHashSet<E>(equals: identical,
+   *                          hashCode: identityHashCode)
    */
   external factory LinkedHashSet.identity();