I’ll suggest rather than on google.docs (especially given the recent problem Ubuntu News has had with gdoc), you consider it just being on this site and kept as a wiki page here.
As example; the current UWN issue (814) is still available as a wiki page which would allow most users of this site to have edit privileges. I requested some testing of it on IRC prior to use (for Ubuntu News) using it & can confirm members of the site have no issues, and according to the discourse site trust level 1 or above) can edit too (all all but new accounts on this site).
The limitation we’ve encountered is less of a problem for a low traffic wiki. There is no capacity for the site to allow multiple people to edit, and no warnings are given if another person has already clicked EDIT, thus if two people end up editing at the same time, when the second person clicks SAVE they’ll overwrite any change(s) made by the first user (they were editing what had been saved on the site at the moment they clicked EDIT, regardless of changes made by the person already editing). The history is still visible on the site though (it’ll show the last save deleted whomever was first to click save), and I’ve not found it onerous to check that regularly (the size of the page, amount & frequency of edits will of course matter). FYI: @Bashing-om will be most aware of what I’m trying to describe here 
Please note: I’ve used UWN814 as example here as it’s currently a wiki page, however that issue is currently in REVIEW & the edit link will disappear rather soon. In a day we’ll start UWN815 & it’ll become our WIP issue which will become the WIKI page example.