code: def release_docs_side_effect(content):
      
      # First replace **all** curly braces.
      result = content.replace("{", "{{").replace("}", "}}")
      # Then reset the actual template arguments.
      result = result.replace("{{version}}", "{version}")
      result = result.replace("{{circleci_build}}", "{circleci_build}")
      result = result.replace("{{travis_build}}", "{travis_build}")
      result = result.replace("{{appveyor_build}}", "{appveyor_build}")
      result = result.replace("{{coveralls_build}}", "{coveralls_build}")
      return result
docs: Updates the template so that curly braces are escaped correctly.
  
      Args:
          content (str): The template for ``docs/index.rst.release.template``.
  
      Returns:
          str: The updated template with properly escaped curly braces.