JDK 9 RFR of JDK-8159330: Improve deprecation text for Class.newInstance

[Wang Weijun]

Why not just clazz.getConstructor().newInstance()?

> +     * can be replaced by
> +     *
> +     * <pre>{@code
> +     * clazz.getConstructor(new Class<?>[0]).newInstance((Object[])null);
> +     * }</pre>