code: public static void appendPrettyHexDump(StringBuilder dump, ByteBuf buf, int offset, int length) {
          HexUtil.appendPrettyHexDump(dump, buf, offset, length);
      }
docs: Appends the prettified multi-line hexadecimal dump of the specified {@link ByteBuf} to the specified
  {@link StringBuilder} that is easy to read by humans, starting at the given {@code offset} using
  the given {@code length}.