--config: remove confusing XQuartz annotation

Apple's X11 is XQuartz, but this can be confusing, and is ultimately
unnecessary for debugging purposes.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Library/Homebrew/cmd/--config.rb

@@ -60,7 +60,7 @@ module Homebrew extend self
 
   def describe_x11
     return "N/A" unless MacOS::XQuartz.installed?
-    return "XQuartz #{MacOS::XQuartz.version} in " + describe_path(MacOS::XQuartz.prefix)
+    return "#{MacOS::XQuartz.version} in " + describe_path(MacOS::XQuartz.prefix)
   end
 
   def describe_perl