fr(Checkbox): Allow `aria-describedby` on checkboxes

[mfairchild365]

Feature Description

There are situations where aria-describedby may be needed on checkboxes.

Use Case

These situations are similar to why the attribute is allowed on radio buttons.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}