code: def parseMarkDownBlock(text):
      
      block = Parser().parse(text)
      # CommonMark can't nest sections, so do it manually
      nestSections(block)
  
      return MarkDown(block)
docs: Parses a block of text, returning a list of docutils nodes
  
      >>> parseMarkdownBlock("Some\n====\n\nblock of text\n\nHeader\n======\n\nblah\n")
      []