Add role="switch" to switches in example code?

Created by: coliff

I’ve just been reading this good article by @argyleink about building a switch component https://web.dev/building-a-switch-component/#overview

I see it uses role=switch. Think this should be added to the Switch Bootstrap docs example code? https://getbootstrap.com/docs/5.1/forms/checks-radios/#switches

Let me know, I’d be happy to open a PR for it.