It would be very boring and take a while, if you got nothing better to do this is the job for you. The wiki page would be done on GitHub and they have a couple different choices of editing that you can choose to format the pages in including markdown.
Do we have to use markdown to edit the text ? Will you be providing references for the edit ? I have spent quite a amount of time editing wiki pages for couple of open source projects and let me tell you,it's not worth 25 bucks.
If someone is still planning to use markdown,here's a better option to edit : dillinger.io