"Iframe element has non-empty accessible name" [cae760]: rephrase Applicability

[Jym77]

• Lift the negation up from the bullet list; I think it make it easier to read when there is one negation instead of two.
• Replace "explicit role of none/presentation" with "marked as decorative". This is the same thing, but I feel this convey better the intention that is explained in the background "there is an attempt to hide them from assistive technologies".

This creates no functional change in the rule.

Closes issue(s):

• N/A

Need for Call for Review:
This will not require a Call for Review (editorial change only)

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