[TYPO3-UG US] extension manual update

[Gabriel Anast]

Alex Heizer wrote:

>Otherwise, I'll continue to work on them in semi-random order.
>  
>
Actually, I would be very good at this as well, and am quite willing to 
start on the list Dimitri suggested. I would, however, rather work "for" 
someone on this. Maybe you (Alex) could "assign" me something, and I'll 
"submit" it back to you so that at least one person has an idea of how 
the "document editing project" as a whole is going.

--gabe