Add documentation for LeadingMarginSpan2.

                                  boolean first, Layout layout);

    /**

     * An extended version of {@link LeadingMarginSpan}, which allows

     * the implementor to specify the number of lines of text to which

     * this object is attached that the "first line of paragraph" margin

     * width will be applied to.

     */

    public interface LeadingMarginSpan2 extends LeadingMarginSpan, WrapTogetherSpan {

        /**

         * Returns the number of lines of text to which this object is

         * attached that the "first line" margin will apply to.

         * Note that if this returns N, the first N lines of the region,

         * not the first N lines of each paragraph, will be given the

         * special margin width.

         */

        public int getLeadingMarginLineCount();

    };