Add links to issue tracker items in what's new.
Add links to issue tracker items in what's new.

mathjax/MathJax-docs,mitya57/mathjax-docs,mitya57/mathjax-docs,Axure/MathJax-docs,Axure/MathJax-docs,mathjax/MathJax-docs,GerHobbelt/MathJax-docs,GerHobbelt/MathJax-docs