Moved Failed Example 4 into Passed Example 9 in HTML images contain no text [0va7u6]

[giacomo-petri]

Closes issue(s): #2397

This PR moves failed example 4 to passing example 9, as SC 1.4.5 Images of Text clearly states in its note that when the same information conveyed by an image of text is also available as real text, the requirement is satisfied.

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This will require a 1 week Call for Review

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[giacomo-petri]

I need to make an adjustment regarding 1.4.9 since it's mapped as well. I'm gonna mark 1.4.9 as secondary requirement (this success criterion is more strict than this rule).

[Jym77]

Background note should link to the Understanding document since it is where the note is.