code: func (c *ContentSpec) TrimShortHTML(input []byte) []byte {
  	first := bytes.Index(input, paragraphIndicator)
  	last := bytes.LastIndex(input, paragraphIndicator)
  	if first == last {
  		input = bytes.TrimSpace(input)
  		input = bytes.TrimPrefix(input, openingPTag)
  		input = bytes.TrimSuffix(input, closingPTag)
  		input = bytes.TrimSpace(input)
  	}
  	return input
  }
docs: // TrimShortHTML removes the <p>/</p> tags from HTML input in the situation
  // where said tags are the only <p> tags in the input and enclose the content
  // of the input (whitespace excluded).