You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: clean_html.rb
    path of file: ./repos/devdocs/lib/docs/filters/cmake
    
    the code of the file until where you have to start completion: module Docs
  class Cmake
    class C
    
      def call
        if root_page?
          css('#release-notes', '#index-and-search').remove

          css('h1').each do |node|
            node.name = 'h2'
          end
        end