merge revision(s) 45604: [Backport #9748]

	* lib/fileutils.rb (FileUtils#copy_entry): update rdoc about
	  preserve option and permissions, following r31123.
	  [ruby-core:62065] [Bug #9748]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@46158 b2dd03c8-39d4-4d8f-98ff-823fe69b080e