uninstall_doc (Gem::DocManager)

    # File lib/rubygems/doc_manager.rb, line 206
      def uninstall_doc
        raise Gem::FilePermissionError.new(@spec.installation_path) unless
        File.writable? @spec.installation_path

        original_name = [
          @spec.name, @spec.version, @spec.original_platform].join '-'

        doc_dir = File.join @spec.installation_path, 'doc', @spec.full_name
        unless File.directory? doc_dir then
          doc_dir = File.join @spec.installation_path, 'doc', original_name
        end

        FileUtils.rm_rf doc_dir

        ri_dir = File.join @spec.installation_path, 'ri', @spec.full_name

        unless File.directory? ri_dir then
          ri_dir = File.join @spec.installation_path, 'ri', original_name
        end

        FileUtils.rm_rf ri_dir
      end