[rubygems/rubygems] [DOC] Enable Gem::Package example

Other code must not be between the doc and class definition.

https://github.com/rubygems/rubygems/commit/366784aae5

lib/rubygems/package.rb

@@ -3,7 +3,12 @@
 # Copyright (C) 2004 Mauricio Julio Fernández Pradier
 # See LICENSE.txt for additional licensing information.
 #++
-#
+
+require_relative "../rubygems"
+require_relative 'security'
+require_relative 'user_interaction'
+
+##
 # Example using a Gem::Package
 #
 # Builds a .gem file given a Gem::Specification. A .gem file is a tarball
@@ -41,10 +46,6 @@
 # #files are the files in the .gem tar file, not the Ruby files in the gem
 # #extract_files and #contents automatically call #verify
 
-require_relative "../rubygems"
-require_relative 'security'
-require_relative 'user_interaction'
-
 class Gem::Package
   include Gem::UserInteraction