[b49b2e] Accessibility support note on empty headings being exposed

[daniel-montalvo]

<< Describe the changes >>

Adds a note to explain that empty headingsare exposed in a screen reader / browser combination, and corrects a typo on a success criteria name.
Closes issue(s):

• closes [b49b2e] Heading is descriptive - Inapplicable examples #2258

Need for Call for Review:
This will not require a Call for Review << choose reason(s): editorial changes (including to the applicability, expectation or examples section), changes to assumptions, background, accessibility support, change to website/test code (not rule), other (explain). >>

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[WilcoFiers]

This is fine, but can you also open an accessibility support issue related to this with the test information showing what the problem was so we can re-test it in the future?

Opened #2361

[daniel-montalvo]

@WilcoFiers

I Opened #2361. Can we proceed with this now?