Joining expectation 2 and 3

[tbostic32]

Joining expectation 2 and 3 makes this rule follow the same pattern as shown in the video element content is media alternative for text, which I prefer as it is overall more concise.

Closes issue(s):

• closes Rejected/clarification needed - "audio element content is media alternative for text" (afb423) #1580

Need for Final Call:
This will not require a Final Call - The changes to the expectation do not affect how the rule is interpreted and so are purely editorial and to be more concise.

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