Modifications to 16 Limitations, Assumptions, or Exceptions #552

Description
Under Test 16's Limitations, Assumptions, or Exceptions:
For Audio Only subheading, remove the sentence "Audio labeled as a media alternative for text does not require additional description if it is indeed equivalent to the text."

For Video Only subheading:

• remove "Video labeled as a media alternative for text does not require additional description if it is indeed equivalent to the text."
• Add: A text equivalent is not required for video that is provided as an alternative for text.

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