dev-cmd/man: Completely remove --link

[issyl0]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
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• Have you successfully run brew man locally and committed any changes?

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• This was deprecated in ec75fbc in 2016! 🗝️ 🧓🏻 :dusty_stick:

[BrewTestBot]

Review period will end on 2021-01-19 at 00:00:00 UTC.

[issyl0]

Ah, yes, the man page code has a man page. ♻️ Thanks @dawidd6!

[MikeMcQuaid]

Nice catch @issyl0!

[BrewTestBot]

Review period ended.