Final call: Improve examples for button-accessible-name

Hey everyone,

I've updated some of the examples in "Button has accessible name":
https://github.com/act-rules/act-rules.github.io/pull/1028

Please give it a read and leave a review if you have any concerns. This
pull request will be merged on January 28th.

Kind regards,

-- 
*Wilco Fiers*
Axe for Web product owner - Co-facilitator WCAG-ACT - Chair ACT-R