docs: fix wording in toasts 'show' doc

[coliff]

Description

Correct a grammatical error in the toasts documentation: replaced "instead" with "or" in the description of the show method to improve clarity (site/src/content/docs/components/toasts.mdx).

Motivation & Context

Typo

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-42428--twbs-bootstrap.netlify.app/docs/5.3/components/toasts/#methods

Related issues

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates the Toasts documentation to improve clarity in the method description table.

Changes:

• Fixes indentation/formatting for the show method row so it aligns with other table entries.
• Improves wording in the show method description for readability.

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