Add information about having equal signs align

There was not source of truth whether to align equal signs or not
in our code. This should help people not align equal signs as well
as help them rethink their code if they have many assignments.
Good point, would this be something new? Maybe under [avoid-long-methods](https://github.com/reachlocal/ruby-style-guide#avoid-long-methods)?

Part of the reason I put it here as `okish` was the idea that things like gemspecs and other config type instances often use this type of organization.