Interesting! I checked the comment history, which has a lot of activity. Most of it is spam suggestions, but I also spotted a few that were accepted. I guess they're also using Google Docs for its collaborative features.

Oh yeah, don't worry about that. Just switch to view only mode if you want to read the actual document.

Edit: If you don't know how, here's a handy tip. Just add "/preview" to the end of any doc to link directly to it's view only mode. So for the document I linked above, it would be: https://docs.google.com/document/d/1ZrIiXypVUvPIRs9JG8AsU55F...