Add note about auditor to How-To-Open-a-Homebrew-Pull-Request.md

[jrschumacher]

During my submission I followed this guide since it is the first link, but it wasn't until we got to the end of the process that I learned I should have created a tap.

This was a great experience for me, but a waste of maintainers time.

• 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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[jrschumacher]

@MikeMcQuaid mind giving it another review. I skimmed some old PRs, and it looks like the shared audit is also run for casks (although if a cask doesn't have a social code registry associated, it looks like that step might be skipped 🤷).

Let me know if any other changes are needed.

[MikeMcQuaid]

Don't think we need to have specific audit output in here, thanks!

[MikeMcQuaid]

Thanks @jrschumacher!

[ZhongRuoyu]

Thanks @jrschumacher! I suggest using URLs from https://docs.brew.sh/ instead because that's where we expect people to read docs (rather than here in the repo).

[MikeMcQuaid]

Whoops, CI failure: https://github.com/Homebrew/brew/actions/runs/10616387548/job/29426655496?pr=18189

[carlocab]

Thanks for the PR!

One suggestion; this should fix the CI failure.

[carlocab]

Thank you!