Moves changes from #49920 to `main`.
Originally targeting `docs-v4.91.0` — retargeted to this branch.
**Related:** #49920
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **Bug Fixes**
* Improved checkbox and radio button helper-text alignment so it lines
up with the associated label.
* Adjusted spacing between controls, labels, and helper text for a
cleaner form layout.
* **Documentation**
* Added component examples demonstrating checkbox and radio buttons with
helper text.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
melpike
af65282522