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/sequelize
    
    the code of the file until where you have to start completion: module Docs
  class Sequelize
    class CleanHtmlFilter < Filter
      def call
        @doc =
    
      def call
        @doc = at_css('article', '.content')

        if at_css('header > h1')
          # Pull the header out of its container
          header = at_css('h1')
          header.parent.add_previous_sibling header
        end