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.

[mdo]

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.

Ah yeah that's a valid distinction. The change we're making here is that every theme class is color mode adaptive. The raw CSS variables are there for people if they need static values.

We could always provide utility map definitions folks could add on to enable those kind of classes. A recipe of sorts for adding or changing features.