I finally found some time to finish the initial version of the documentation update. I'll attach here the tarball containing the updated screenshots and makefile for them, and the updated xfdesktop.xml.in. I did not document the transparent color feature as I don't manage to get it working, maybe if you explain to me what it is supposed to do, I'll be able to see what it does and to document it. Any comments are welcome, my English sucks a bit.
Created attachment 2034 tarball with the screenshots and the makefile
Created attachment 2035 the documentation file
Created attachment 2042 doc file I updated the documentation to give more details on the "Transparent" option, feel free to comment on the current state.
I honestly don't have time to review all this, so I'll just check it in. The amount of it that I did read looked great, though. I'll try too look at it again later, but I just want to make sure it doesn't get left out for the next beta.