Don't need to sort examples again in Slate writer

IndexHelper already keeps examples sorted.

Author: Leonard Chin

lib/rspec_api_documentation/writers/slate_writer.rb

@@ -24,10 +24,8 @@ def write
           file.write markup_index_class.new(index, configuration).render
 
           IndexHelper.sections(index.examples, @configuration).each do |section|
-
             file.write "# #{section[:resource_name]}\n\n"
             file.write "#{section[:resource_explanation]}\n\n"
-            section[:examples].sort_by!(&:description) unless configuration.keep_source_order
 
             section[:examples].each do |example|
               markup_example = markup_example_class.new(example, configuration)