Documentation for LTS and reveal slot shouldn't exist

[ArakTaiRoth]

Info

Currently for Angular and React LTS documentation, snippets and properties exist for the reveal slot that was added to Checkbox and Radio component documentation. These shouldn't exist for LTS, as the feature is only on the latest version.

Acceptance Criteria:

1. Remove reveal and revealarialabel properties from Angular LTS Checkbox documentation
2. Remove Reveal example from Angular LTS Checkbox and Radio documentation
3. Remove Reveal example from React LTS Checkbox and Radio documentation