We should expand upon the "don't add translate tags" warning and explain what the
!--T:n--tags are and how they should be handled.
(It seems like it didn't like the tags so I removed the <> for convenience.)
(This is mostly a note to myself, but if someone has time to do it before me - go ahead if you want.)
For future reference, you need to use <nowiki></nowiki> tags around anything that mediawiki would see as a command.
Hm, I think I tried <pre></pre> and <nowiki></nowiki> but it still complained. Maybe I missed the latter, I'll find out when I write the text. :)
What exactly are you going to write about? We have covered it in the appropriate pages. And pages are linked, wherever appropriate. Dulpication makes it hard to maintain.
Which pages would that be, EditMarkup? I think it's very relevant on this page, since you'll see it if you edit some pages, and many contributors are probably unsure of how to handle them. The first two tags only need a short mention, but <!--T:n--> should be explained in my opinion (what to do if you add, move or remove text etc.).