update conventions and "private to file" and "readonly publicly", https://github.com/phetsims/ratio-and-proportion/issues/405
update conventions and "private to file" and "readonly publicly", https://github.com/phetsims/ratio-and-proportion/issues/405

phetsims/phet-info,phetsims/phet-info,phetsims/phet-info,phetsims/phet-info