Currently Godot doesn't support live editing like Google Docs would. It's very hard to do right, something even more complicated than making a multiplayer game in the first place.
If what you are talking about is running Godot on a project where files are modified externally by others, there is a very, very high chance that you will step on each other's toes or overwrite changes.
The best way to work collaboratively is currently using version control such as Git, SVN or Mercurial. It's not "live" editing, but it has been working great already for a very long time.