Regenerate checkout docs with sentence-case fixes

[jhoffmcd]

Background

This pull request updates component documentation in the UI extensions checkout surface to improve clarity and consistency across component descriptions.

Solution

Updated component documentation with more detailed and consistent descriptions:

• Button component: Changed "Use button" to "Use buttons" for better grammar
• DropZone component: Renamed to "Drop zone" and expanded description to include drag-and-drop functionality, file type validation, and error handling details
• Modal component: Enhanced description to explain the commandFor attribute trigger mechanism and scrolling behavior
• Popover component: Completely rewrote description to explain the commandFor attribute, provide clearer usage guidance, and include a reference to the modal component for comparison
• Typography components: Updated subcategory from "Titles and text" to "Typography and content" for abbreviation and time components

These changes provide developers with clearer guidance on when and how to use each component, including technical implementation details and cross-references to related components.

🎩

• Enhanced component descriptions with technical implementation details
• Improved grammar and consistency across component documentation
• Added cross-references between related components (popover/modal)
• Updated component categorization for better organization

Checklist

• I have 🎩'd these changes
• I have updated relevant documentation

[jhoffmcd]

• Regenerate checkout docs with sentence-case fixes #4049 👈 (View in Graphite)
• Fix doc generation for sentence-case component names #4048
• 2026-01

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