The XMPP Standards Foundation has moved a while back the repository for the XMPP specification documents to Github: xsf/xeps
This is quite an important change in the XMPP Extensions Proposal workflow. It is now easier than before to track the changes as they are happening.
I am curious to see the contributions rate in the next few months but I bet we will see involvement and contributions increasing. Even for small fixes and typos, this is a good thing.