In preparation of the removal of the -XhtmlVersion option from doclint, an internal usage of --doclint-format in javac needs to be removed. It receives a value from --doclint-format, then pass it to -XhtmlVersion.

In javac Arguments class, we should delete these lines at about 855

        String format = options.get(Option.DOCLINT_FORMAT);
        if (format != null) {
            doclintOpts.add(DocLint.XHTML_VERSION_PREFIX + format);
        }