update docs.rs maintenance info

[syphar]

based on #623

[syphar]

@carols10cents this fixes the command and updates the list of users.

I don't know if all these users are on the help@docs.rs list, can someone find out? Then we probably could replace the list with the email address.

Of course this then won't include infra-team members

[ehuss]

@syphar, Just checking if you are still interested in working on this?