code: def paragraph(node):
      
      text = ''
      if node.string_content is not None:
          text = node.string_content
      o = nodes.paragraph('', ' '.join(text))
      o.line = node.sourcepos[0][0]
      for n in MarkDown(node):
          o.append(n)
  
      return o
docs: Process a paragraph, which includes all content under it