Documentation Updates

Acceptable-Formulae:

* Makes the language around stable versions stricter.
* Fixes the Homebrew/Head-only lack-of-hyphen.
* Adds Homebrew/Devel-only.

Formula-Cookbook:
* Adds a link to Interesting-Taps-&-Branches.
* Fixes the Python language to match Tim’s latest guidelines.
* Adds a note on options that aren’t ` build-with? ` or `
build-without? `.

Interesting-Taps-&-Branches:
* Slightly modifies the Versions language to better match what the
repository actually ships.
* Adds Homebrew/Devel-only to the language.

Closes #35298.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>