added "newer version available" link as per Documentation update process
added "newer version available" link as per Documentation update process
mitya57/mathjax-docs,GerHobbelt/MathJax-docs,Axure/MathJax-docs,Axure/MathJax-docs,mathjax/MathJax-docs,mathjax/MathJax-docs,mitya57/mathjax-docs,GerHobbelt/MathJax-docs