Charts section results in conflicting statements

[mattgarrish]

Because this section uses if statements throughout, it's possible that you can mix statements about accessible content with the final statement saying the accessibility isn't known. All that has to happen is one of the OR conditions in the last statement has to be true. For example, if you have accessible charts but inaccessible math, you'll get both:

Charts and diagrams have extended descriptions

and

accessibility of formulas, charts, math, and diagrams not identified as being accessible

[gregoriopellegrino]

This section will change significantly in both title and statements. I propose to close the issue and wait for the new version.