Reword uses comment

Library/Homebrew/cmd/uses.rb

@@ -1,8 +1,7 @@
 require 'formula'
 
-# `brew uses foo bar` now returns formula that use both foo and bar
-# Rationale: If you want the union just run the command twice and
-# concatenate the results.
+# `brew uses foo bar` returns formulae that use both foo and bar
+# If you want the union, run the command twice and concatenate the results.
 # The intersection is harder to achieve with shell tools.
 
 module Homebrew extend self