docs(dialog): updated dialog docs for accessbility

[nikkimk]

Description

Related issue(s)

Motivation and context

How has this been tested?

• Test case 1

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• Test case 2

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• Did it pass in Desktop?

• Did it pass in Mobile?

• Did it pass in iPad?

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (minor updates related to the tooling or maintenance of the repository, does not impact compiled assets)

Checklist

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• If my change required a change to the documentation, I have updated the documentation in this pull request.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have reviewed at the Accessibility Practices for this feature, see: Aria Practices

Best practices

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Review the following VRT differences

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