Hi Hans!
my wiki username is >> hakre << and I'm planning to do some minor
editing work in the wiki first of all for formatting things streamlining
same-page content, that are adding missing colons at the end of
introductory sentences to console instructions on https://wiki.php.net/
vcs/gitfaq after reading through CONTRIBUTIONS.md .
In my opinion, we should move all still relevant contents from the Wiki 
to somewhere else (except the RFCs, for now).  There is already quite 
some duplication/overlap and grossly outdated info, and in the long run 
that likely gets worse.
Some parts of gitfaq can likely be dropped; I guess nowadays most 
developers are generally comfortable using Git.  Some parts appear to be 
more appriate in gitworkflow (which should probably be moved to 
https://github.com/php/policies).  And some parts are likely best 
moved to https://github.com/php/php-src/tree/master/docs.  Or maybe 
move the whole page to php-src/docs as first step.  Anyhow, moving 
contents to Github also allows for better collaboration via PRs.
After a move, the page can be quickly edited to link to the new place(s).
Note that I'm not against giving you edit access to the Wiki, but it's 
not quite that simple; well, it's not hard, but would be uncommon nowadays.
Christoph