DATAJPA-1443 - Polishing.

Fixed JavaDoc link in HibernateProxyDetector.
ProxyDetector is imported so there’s no need to use a full-qualified name here.

Original pull request: #296.

src/main/java/org/springframework/data/jpa/util/HibernateProxyDetector.java

@@ -22,7 +22,7 @@ import org.springframework.data.util.ProxyUtils.ProxyDetector;
 import org.springframework.util.ClassUtils;
 
 /**
- * {@link org.springframework.data.util.ProxyDetector} to explicitly check for Hibernate's {@link HibernateProxy}.
+ * {@link ProxyDetector} to explicitly check for Hibernate's {@link HibernateProxy}.
  * 
  * @author Oliver Gierke
  */