[Checklist] Designated initializers
[Checklist] Designated initializers

Clarifying what to do when inheriting designated initializers.
samnm/material-components-ios,material-components/material-components-ios,brianjmoore/material-components-ios,chriscox/material-components-ios,willlarche/material-components-ios,sigito/material-components-ios,Eccelor/material-components-ios,brianjmoore/material-components-ios,chriscox/material-components-ios,samnm/material-components-ios,willlarche/material-components-ios,Eccelor/material-components-ios,brianjmoore/material-components-ios,material-components/material-components-ios,randallli/material-components-ios,samnm/material-components-ios,chriscox/material-components-ios,material-components/material-components-ios,sigito/material-components-ios,chriscox/material-components-ios,sigito/material-components-ios,samnm/material-components-ios,brianjmoore/material-components-ios,samnm/material-components-ios,randallli/material-components-ios,willlarche/material-components-ios,chriscox/material-components-ios,Eccelor/material-components-ios,sigito/material-components-ios,randallli/material-components-ios,randallli/material-components-ios,randallli/material-components-ios,willlarche/material-components-ios,sigito/material-components-ios,randallli/material-components-ios,willlarche/material-components-ios,Eccelor/material-components-ios,material-components/material-components-ios,material-components/material-components-ios,brianjmoore/material-components-ios,Eccelor/material-components-ios