docs: use short links.

docs/Acceptable-Formulae.md

docs/Bottles.md

docs/Brew-Test-Bot-For-Core-Contributors.md

docs/Building-Against-Non-Homebrew-Dependencies.md

docs/Common-Issues.md

docs/External-Commands.md

docs/FAQ.md

docs/Formula-Cookbook.md

docs/Homebrew-and-Python.md

docs/How-To-Open-a-Homebrew-Pull-Request.md

docs/How-to-Create-and-Maintain-a-Tap.md

...e-outside-Homebrew-with-Homebrew-keg-only-dependencies.md

docs/Installation.md

docs/Maintainer-Guidelines.md

docs/New-Maintainer-Checklist.md

docs/Node-for-Formula-Authors.md

docs/README.md

docs/Tips-N'-Tricks.md

docs/Troubleshooting.md

docs/Versions.md