Update image-button-non-empty-accessible-name-59796f.md

[giacomo-petri]

Added:

• failed example 3
• updated "Accessibility Support" section

Closes issue(s): act-rules#1861

Need for Call for Review:
This will require a 1 week Call for Review << small changes affecting a small number of test cases, if in doubt do not use this.

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Pull Request Etiquette

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• Make sure you're requesting to pull a branch (right side) to the develop branch (left side).
• Make sure you do not remove the "How to Review and Approve" section in your pull request description

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• Here you will have the option to leave comments on different lines.
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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 7 committers have signed the CLA.

✅ giacomo-petri
❌ Jym77
❌ ChrisLoiselle
❌ HelenBurge
❌ WilcoFiers
❌ daniel-montalvo
❌ wcreedle
_{You have signed the CLA already but the status is still pending? Let us recheck it.}