Merge pull request #1751 from alyssais/uninstall_message

uninstall: a couple of dependency error/warning message improvements

Library/Homebrew/cmd/uninstall.rb

@@ -121,7 +121,7 @@ module Homebrew
     end
 
     def sample_command
-      "brew uninstall --ignore-dependencies #{list reqs.map(&:name)}"
+      "brew uninstall --ignore-dependencies #{ARGV.named.join(" ")}"
     end
 
     def are_required_by_deps