move math.js mention to the relevant todo item

doc/forum/Formatting_algorithms.mdwn

@@ -43,6 +43,4 @@ I start writing many algorithms :-)
 > <http://imgur.com/nT6mefx>
 > 
 > I think it would be great if someone [[wrote a
-> plugin|todo/Add_nicer_math_formatting]] for [math.js](http://mathjs.org), as
-> talking to my semantic-web/scientist colleagues, that's the current
-> state-of-the-art. -- [[Jon]].
+> plugin for something nicer|todo/Add_nicer_math_formatting]]. -- [[Jon]]

doc/todo/Add_nicer_math_formatting.mdwn

@@ -25,4 +25,7 @@ I think [mathjax](http://www.mathjax.org/) would be the best option. This is the
 
 > I've updated Jason Blevin's pandoc plugin to permit tighter integration between Ikiwiki and Pandoc. Given the features Pandoc has added over the past 6-12 months, this makes for a very powerful combination, e.g. with code block syntax highlighting and lots of options for how to process and display inline TeX. Both jsMath and MathJaX are supported, along with many other methods. See https://github.com/profjim/pandoc-iki for details. --Profjim
 
+> talking to my semantic-web/scientist colleagues, [math.js](http://mathjs.org)
+> is apparently the current state-of-the-art. -- [[Jon]].
+
 [[!tag wishlist]]