Final call: Update example descriptions iframe-acc-name rule

Hey folks,

Here's another final call, for the iframe has accessible name rule. This is
fixing some example descriptions and getting rid of some unnecessary
examples.
https://github.com/act-rules/act-rules.github.io/pull/1219

This final call lasts 7 days, closing on March 24th

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