rubocops/text: Declare "revision 0" in formulae as unnecessary

[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?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

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• This came up in a user contribution recently so here's a RuboCop for it.
• I'm getting some weird test failures on Sonoma for some reason so I'll rely on CI for running all of brew tests rather than just the one I wrote.

[MikeMcQuaid]

Thanks again @issyl0!