It doesn't take a huge amount to set this up (encouraging people to
write the words is quite another matter).
Source control: http://git.ocamlcore.org/ - check
Decide on a format: http://en.wikipedia.org/wiki/DocBook - check
License: http://creativecommons.org/ CC-BY-SA - check
Mailing list for editorial review of submissions:
http://ocamlcore.org/ - check
Outline and subject areas:
- Introduction to the language
- Language core
- Libraries
- Camlp4
- ...
Decide who will be in charge of each area ...