Update brew's man page formatting and grammar

Library/Homebrew/cmd/cleanup.rb

Library/Homebrew/cmd/desc.rb

Library/Homebrew/cmd/info.rb

Library/Homebrew/cmd/outdated.rb

Library/Homebrew/cmd/readall.rb

Library/Homebrew/cmd/search.rb

Library/Homebrew/cmd/tap-info.rb

Library/Homebrew/cmd/unlink.rb

Library/Homebrew/cmd/unpack.rb

Library/Homebrew/cmd/uses.rb

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

Library/Homebrew/dev-cmd/bottle.rb

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

Library/Homebrew/dev-cmd/create.rb

Library/Homebrew/dev-cmd/formula.rb

Library/Homebrew/dev-cmd/linkage.rb

Library/Homebrew/dev-cmd/mirror.rb

Library/Homebrew/dev-cmd/release-notes.rb

Library/Homebrew/dev-cmd/tests.rb

Library/Homebrew/dev-cmd/update-test.rb