v6: docs updates

[coliff]

Description / Motivation & Context

various minor fixes across docs and examples.

side note: there is a lot of usage of the bg-dark utility class which isn't in v6. We could replace with bg-black I suppose, but bg-dark was/is a useful utility class. I'd be happy to see it re-added!

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-42394--twbs-bootstrap.netlify.app/

[Copilot]

Pull request overview

This PR updates Bootstrap v6 documentation and example snippets to align with the current v6 utility class names/tokens (notably fg-* color utilities) and removes an inaccurate migration-table entry.

Changes:

• Fix a docs color example to use bg-black (since bg-dark is not present) for the .fg-white sample.
• Remove the “Stepper” row from the v5→v6 class migration table (it was not applicable as a v5 “before” class).
• Update multiple Astro examples to replace deprecated/nonexistent text-* color utility classes with the v6 fg-* equivalents (including emphasis variants).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
site/src/content/docs/utilities/colors.mdx	Corrects a color utility example to use an available background utility (bg-black).
site/src/content/docs/guides/migration.mdx	Removes an inapplicable migration mapping row for “Stepper”.
site/src/assets/examples/dialogs/index.astro	Updates button text coloring to use v6 fg-primary utilities.
site/src/assets/examples/checkout/index.astro	Updates “Your cart” and promo code coloring to use fg-* utilities.
site/src/assets/examples/blog/index.astro	Updates emphasis color utilities to fg-emphasis-* variants.

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[mdo]

Thanks for this! The replacement for .bg-dark would be .bg-inverse if you want to swap those out at some point :).

[coliff]

The replacement for .bg-dark would be .bg-inverse

Oh, I'll look into updating that later today, though i thought bg-dark was ALWAYS dark (in light and dark theme) and bg-inverse changes depending on theme.