code: public static String unescapeXMLComment(String content)
      {
          StringBuffer str = new StringBuffer(content.length());
  
          char[] buff = content.toCharArray();
          boolean escaped = false;
          for (char c : buff) {
              if (!escaped && c == '\\') {
                  escaped = true;
                  continue;
              }
  
              str.append(c);
              escaped = false;
          }
  
          return str.toString();
      }
docs: XML comment does not support some characters inside its content but there is no official escaping/unescaping for
  it so we made our own.
  
  @param content the XML comment content to unescape
  @return the unescaped content.
  @see #escapeXMLComment(String)
  @since 1.9M2