DevDocs: update all component readmes to adhere to a standard template

[davewhitley]

Standard template can be found here: #24343

Based on my personal experience, here is a list of components that should be done first:

• [x] - Banner
• [x] Card
• [x] - ButtonGroup #24382
• [x] - Buttons #24343
• [ ] - SplitButton
• [ ] GlobalNotice
• [x] Notice #24922
• [ ] Header
• [x] FoldableCard #24934
• [ ] SectionNav
• [x] SectionHeader #24935
• [x] EmptyContent #24492
• [x] Pagination #24936
• [x] Segmented Control #24691

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[github-actions[bot]]

This issue is stale because it has been 180 days with no activity. You can keep the issue open by adding a comment. If you do, please provide additional context and explain why you’d like it to remain open. You can also close the issue yourself — if you do, please add a brief explanation and apply one of relevant issue close labels.