code: def insert_break(lines, break_pos=9):
      
      def line_filter(line):
          if len(line) == 0:
              return True
          return any(line.startswith(c) for c in "-*+")
  
      if len(lines) <= break_pos:
          return lines
      newlines = [
          i for i, line in enumerate(lines[break_pos:], start=break_pos)
          if line_filter(line.strip())]
      if len(newlines) > 0:
          break_pos = newlines[0]
      lines.insert(break_pos, "<!--more-->\n")
      return lines
docs: Insert a <!--more--> tag for larger release notes.
  
      Parameters
      ----------
      lines : list of str
          The content of the release note.
      break_pos : int
          Line number before which a break should approximately be inserted.
  
      Returns
      -------
      list of str
          The text with the inserted tag or no modification if it was
          sufficiently short.