code: public ToStringBuilder append(final String fieldName, final double[] array) {
          style.append(buffer, fieldName, array, null);
          return this;
      }
docs: <p>Append to the <code>toString</code> a <code>double</code>
  array.</p>
  
  @param fieldName  the field name
  @param array  the array to add to the <code>toString</code>
  @return this