[Research](Toast): Deprecated variant types

[caseyisonit]

Code of conduct

• I agree to follow this project's code of conduct.

Description of issue

In Toast.ts, the variants error, warning, and success have //deprecated next to them but they are not marked or documented for deprecation anywhere else in the code.

Resolution:

• if not deprecated, clean up the comments
• if deprecated, properly mark the variant types as deprecate and documented in our args tables across all documentation sites with a date of decrecation