chore: Update Switch docs

[alimpens]

Describe the pull request

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What

It updates our guidelines for the Switch component.

Why

We mentioned aria-label in the docs, which we advise against in other guidelines. The docs distinguished between a 'standalone' element and a form control, which is a little odd. Switch should always have a label I think, whether it's used in a form or not.

How

By removing references to aria-label and 'standalone component'.

Checklist

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• Add or update unit tests
• Add or update documentation
• Add or update stories
• Add or update exports in index.* files
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[VincentSmedinga]

I am not convinced that a Switch should be used in a Form at all, but removing mentions of aria-label warrants merging the PR.

I’ve applied the rewording of the ‘interactive elements’ link in other places too.