Form > Update docs to utilize new template

Background

As part of #541 (closed), we worked on a new page template for the Usage tab of component pages.

Resources

See the parent epic for the new template, as well as a few examples of components that have already been migrated to the new structure.

Proposal

Update the form component usage tab to be in alignment with the changes.

This may involve rewording content in addition to restructuring sections. After pushing up your MR, assign it to another Foundations design member for review.