Added some additional doc links to Changes file.
Added some additional doc links to Changes file.

liukaijv/XlsxWriter,jvrsantacruz/XlsxWriter,applicationdevm/XlsxWriter,liukaijv/XlsxWriter,gechong/XlsxWriter,jmcnamara/XlsxWriter,liukaijv/XlsxWriter,mdeemer/XlsxWriter,liukaijv/XlsxWriter,mdeemer/XlsxWriter,jkyeung/XlsxWriter,yaojingwu1992/XlsxWriter,applicationdevm/XlsxWriter,jmcnamara/XlsxWriter,mdeemer/XlsxWriter,yaojingwu1992/XlsxWriter,yaojingwu1992/XlsxWriter,applicationdevm/XlsxWriter,jmcnamara/XlsxWriter,gechong/XlsxWriter,Thhhza/XlsxWriter,Thhhza/XlsxWriter,applicationdevm/XlsxWriter,seize-the-dave/XlsxWriter,yaojingwu1992/XlsxWriter,Thhhza/XlsxWriter,jvrsantacruz/XlsxWriter,gechong/XlsxWriter,seize-the-dave/XlsxWriter,jkyeung/XlsxWriter,jkyeung/XlsxWriter,gechong/XlsxWriter,jkyeung/XlsxWriter,Thhhza/XlsxWriter,mdeemer/XlsxWriter,seize-the-dave/XlsxWriter,jvrsantacruz/XlsxWriter,jvrsantacruz/XlsxWriter,jmcnamara/XlsxWriter,seize-the-dave/XlsxWriter