remove link as import is not used

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@474494 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/util/optional/WeakishReference12.java

@@ -24,7 +24,7 @@ import org.apache.tools.ant.util.WeakishReference;
  * This is a reference that really is is Weak, as it uses the
  * appropriate java.lang.ref class.
  * @deprecated since 1.7.
- *             Just use {@link WeakReference} directly.
+ *             Just use WeakReference directly.
  * Note that in ant1.7 is parent was changed to extend HardReference.
  * This is because the latter has access to the (package scoped)
  * WeakishReference(Object) constructor, and both that and this are thin