Yup, does the same for me, and has already been reported here… and Chrome does it so stubbornly for me, every time I edit a rule or create a new one, it is auto-filled in and I have to clear the field, but sometimes Chrome still sneaks it in again before I save.
I’ve googled a bit and allegedly, a possible solution is to click the “clear cache” button on the chrome://autofill-internals page, followed by closing and re-opening affected tabs. This seems to do the trick for me, I have yet to see for how long. Clicking in the documentation URL field still opens some suggestions, but they look more like “text I have entered into this field in the past” suggestions than a list of usernames Chrome knows, so it might actually have worked.