Update Contributing.md

[cortices]

Indicate that revision line should come before head line as enforced by brew style. Also suggest to run brew style again to double-check.

• Have you followed the guidelines for contributing?
• Have you checked that there aren't other open pull requests for the same formula update/change?

[MikeMcQuaid]

Not every formula has a head line so this is a bit confusing 🤔. Maybe we could recommend brew style --fix instead which will fix this up?

[cortices]

Perhaps

Suggested change

	rebuilt and redistributed, add a line of the form `revision 1` to the formula above the `head` line,
	rebuilt and redistributed, add a line of the form `revision 1` to the formula,
	or add 1 to the revision number already present. Run `brew style foo` again, and if desired include the `--fix` flag to automatically correct the formula to standard style.

Alternatively, is it important that the revision tag be suggested only after install/testing? Could it not be included in the earlier section around L31:

If you are already well versed in the use of `git`, then you can find the local
copy of the `homebrew-core` repository in this directory
(`$(brew --prefix)/Homebrew/Library/Taps/homebrew/homebrew-core/`).
Modify the formula there, leaving the section `bottle do ... end` unchanged, and if you think it is needed to force the corresponding bottles to be rebuilt and redistributed, add a line of the form `revision 1` to the formula,
 or add 1 to the revision number already present.
Prepare a pull request as you usually do.  Before submitting your pull request, be sure to test it
with these commands:

[MikeMcQuaid]

Yeh, it feels like it makes more sense earlier. I like the idea of just recommending brew style --fix before committing 👍

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