Is your feature request related to a problem? Please describe.

We offer an error state for form elements under the usa-form-group--error class but do not offer any guidance on it's usage.

Describe the solution you'd like

We should:

• Confirm usa-form-group--error is in a usable state
• Define the form components that should be able to use it
• Provide guidance on the form component page and/or specific component pages.

Describe alternatives you've considered

No response

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct.
• I checked the current issues for duplicate feature requests.