Adding javadoc to note that the ToStringStyle HAS to be the same (LANG-372)

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@594386 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/commons/lang/builder/ToStringStyle.java

@@ -313,6 +313,7 @@ protected ToStringStyle() {
 
     /**
      * <p>Append to the <code>toString</code> the superclass toString.</p>
+     * <p>NOTE: It assumes that the toString has been created from the same ToStringStyle. </p>
      * 
      * <p>A <code>null</code> <code>superToString</code> is ignored.</p>
      * 
@@ -326,6 +327,7 @@ public void appendSuper(StringBuffer buffer, String superToString) {
 
     /**
      * <p>Append to the <code>toString</code> another toString.</p>
+     * <p>NOTE: It assumes that the toString has been created from the same ToStringStyle. </p>
      * 
      * <p>A <code>null</code> <code>toString</code> is ignored.</p>
      *