Call for review: Correct two ARIA examples

Hey folks,

These pull request correct two issues reported by the ARIA Working Group
review:
- https://github.com/act-rules/act-rules.github.io/pull/2139
- https://github.com/act-rules/act-rules.github.io/pull/2137

They are pretty minor changes, but please have a look anyway. If you have
any concerns leave a review before January 22nd.

Kind regards,

-- 
*Wilco Fiers*
Axe-core & Axe-linter product owner - WCAG 3 Project Manager - Facilitator
ACT Task Force