code: protected void appendDetail(final StringBuffer buffer, final String fieldName, final Map<?, ?> map) {
          buffer.append(map);
      }
docs: <p>Append to the <code>toString</code> a <code>Map</code>.</p>
  
  @param buffer  the <code>StringBuffer</code> to populate
  @param fieldName  the field name, typically not used as already appended
  @param map  the <code>Map</code> to add to the <code>toString</code>,
  not <code>null</code>