docs/acceptable-casks: clarify notability

[bevanjkay]

• 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 lgtm (style, typechecking and tests) with your changes locally?

---

• AI was used to generate or assist with generating this PR. Please specify below how you used AI to help you, and what steps you have taken to manually verify the changes.

---

Clarify rejection criteria for self-submitted casks based on repository notability.

[Copilot]

Pull request overview

This pull request clarifies the rejection criteria for self-submitted casks in the Homebrew documentation. It adds stricter notability thresholds (3x multiplier) for cases where the PR author is also the repository owner, aiming to prevent low-quality or promotional self-submissions.

Changes:

• Updated the notability criteria documentation to distinguish between general submissions (30 forks, 30 watchers, 75 stars) and self-submitted casks (90 forks, 90 watchers, 225 stars)

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.