Improve audio conversion tip

[felipecrs]

I spent quite a good time to figure out that -c copy overlaps with -c:a aac.

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[felipecrs]

Hey maintainers, I think this one is quite simple and would be a good addition to the docs. No?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[felipecrs]

/cc @blakeblackshear

[blakeblackshear]

I haven't merged this because I would rather show a full example of the output args with audio added. This still seems just as confusing.

[felipecrs]

Sure, let me see if I can enhance this.

[felipecrs]

@blakeblackshear done. Please let me know if it looks better.