Made the Foundation's acronym consistent across pages

Most instances were using FSSF, however a few places FSF was used instead. FSSF seems to be more official, and [FSF is already taken](http://www.fsf.org).

Other small changes:

* 85aa17e - the Foundation page (at the least, other pages could as well) should ["introduce" the acronym](http://www.monash.edu.au/lls/llonline/writing/general/academic/3.4.xml) before it's used
* a8807f7 - corrects the indentation for second-level bullet points to make the page easier to read