Revert "removed double javadoc"

This reverts commit 2d26c4992e6c7689f67a8e8410ca7d65909b8d01.

org.springframework.orm/src/main/java/org/springframework/orm/hibernate3/SessionFactoryBuilderSupport.java

@@ -497,6 +497,18 @@ public abstract class SessionFactoryBuilderSupport<This extends SessionFactoryBu
 		}
 	}
 
+	/**
+	 * Subclasses can override this method to perform custom initialization
+	 * of the Configuration instance used for SessionFactory creation.
+	 * The properties of this Builder will be applied to
+	 * the Configuration object that gets returned here.
+	 * <p>The default implementation creates a new Configuration instance.
+	 * A custom implementation could prepare the instance in a specific way,
+	 * or use a custom Configuration subclass.
+	 * @return the Configuration instance
+	 * @throws HibernateException in case of Hibernate initialization errors
+	 * @see org.hibernate.cfg.Configuration#Configuration()
+	 */
 	/**
 	 * Instantiate and return an instance of the {@link Configuration} class
 	 * type for this builder. Subclasses may override in order to customize