Deprecate 4.1.1 parsing rules

[WilcoFiers]

As has been discussed during TPAC and on the most recent TF call. Because WCAG 2.2 is removing 4.1.1, and for WCAG 2.1 and 2.0 a note has been added that says HTML and XML are always satisfied.

Need for Call for Review: 2 weeks

important: This PR will not be merged until WCAG 2.1's republication with the new note is complete.

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[Jym77]

Call for review has ended, merging.