code: def format_help_string(help_string):
      """
      Formats the specified ``help_string`` to obtain a Mermaid-compatible help string. For example,
      this method replaces quotation marks with their HTML representation.
  
      :param help_string: The raw help string.
      :return: A Mermaid-compatible help string.
      """
      return help_string.replace('"', "&bsol;#quot;").replace(
          "'", "&bsol;&#39;"
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: format_help_string(help_string) and returns: help_string