Font style utilities did not contained "-style-" in BS4

[jelhan]

Description

CSS font style utility classes are named .font-italic and .font-normal in Bootstrap 4. The migration guides for Bootstrap 5 wrongly reference them as .font-style-*.

Motivation & Context

This fixes an error in the Bootstrap 5 migration guides.

Type of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would change existing functionality)

Checklist

• I have read the contributing guidelines
• My code follows the code style of the project (using npm run lint)
• My change introduces changes to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

Live previews

• https://deploy-preview-{your_pr_number}--twbs-bootstrap.netlify.app/

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