Use https for all docs.brew.sh links.

CONTRIBUTING.md

Library/Homebrew/README.md

Library/Homebrew/cmd/analytics.rb

Library/Homebrew/cmd/help.rb

Library/Homebrew/cmd/info.rb

Library/Homebrew/cmd/tap-info.rb

Library/Homebrew/cmd/update-report.rb

Library/Homebrew/dev-cmd/create.rb

Library/Homebrew/dev-cmd/tap-new.rb

Library/Homebrew/formula.rb

Library/Homebrew/manpages/brew.1.md.erb

Library/Homebrew/missing_formula.rb

Library/Homebrew/os.rb

Library/Homebrew/utils/analytics.rb

README.md

docs/Common-Issues.md

docs/Formula-Cookbook.md

docs/Manpage.md

docs/New-Maintainer-Checklist.md

docs/_layouts/index.html