manpages: whitespace fixes

Library/Homebrew/cmd/--env.rb

Library/Homebrew/cmd/cleanup.rb

Library/Homebrew/cmd/desc.rb

Library/Homebrew/cmd/diy.rb

Library/Homebrew/cmd/fetch.rb

Library/Homebrew/cmd/info.rb

Library/Homebrew/cmd/install.rb

Library/Homebrew/cmd/outdated.rb

Library/Homebrew/cmd/reinstall.rb

Library/Homebrew/cmd/sh.rb

Library/Homebrew/cmd/tap-info.rb

Library/Homebrew/cmd/unpack.rb

Library/Homebrew/cmd/upgrade.rb

Library/Homebrew/dev-cmd/bump-formula-pr.rb

Library/Homebrew/dev-cmd/bump-revision.rb

Library/Homebrew/dev-cmd/extract.rb

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