Call for review: image name descriptive: Improve the examples

Hey folks,

This pull request replaces canvas images of text with a canvas with the W3C
logo. This avoids a success criterion 1.4.5 violation in a rule that should
just be about testing 1.1.1. You can review the changes here:
https://github.com/act-rules/act-rules.github.io/pull/1800

This call for review lasts 1 week, ending on March 15th. If you have any
feedback please leave a review before that date.

Kind regards,

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