Tweak to MathJax example
Tweak to MathJax example

Added a missing comma and used an actual macro so that the MathJax example runs right out of the box upon a copy/paste.
lecovi/reveal.js,siddhartha-gadgil/presentations,siddhartha-gadgil/presentations,rbtcollins/reveal.js,tehfedaykin/10CommandmentsofCommunityOrganizing,tehfedaykin/10CommandmentsofCommunityOrganizing,maximesinclair/presentations,rbtcollins/reveal.js,seefood/DIYHolidays,Jean85/reveal.js,dbs/reveal.js,dbs/reveal.js,siddhartha-gadgil/presentations,10xEngineer/reveal.js,rbtcollins/reveal.js,rbtcollins/reveal.js,10xEngineer/reveal.js,lvh/reveal.js,jlevallois/Kreveal.js,maximesinclair/presentations,Jean85/reveal.js,rbtcollins/reveal.js,rbtcollins/reveal.js,lecovi/reveal.js,jayramj/agile-retro,lvh/reveal.js,jlevallois/Kreveal.js,kenkunz/js-crash-course,jayramj/agile-retro,seefood/DIYHolidays,lecovi/reveal.js,kenkunz/js-crash-course,hakimel/reveal.js,hakimel/reveal.js