TIFF javadoc contains HTML entities inside {@code} tags

Including HTML entities inside {@code} tags results in incorrect javadoc. For example

     * @throws NullPointerException if {@code tag == null}.

generates

    NullPointerException - if tag == null.

which is clearly not what was intended. The above case should be corrected for example to be

     * @throws NullPointerException if {@code tag == null}.

or

     * @throws NullPointerException if {@code tag} is {@code null}.

Another case is

     * @throws IllegalArgumentException if {@code count < 0}.

which generates

    IllegalArgumentException - if count < 0.

and should be changed instead to

     * @throws IllegalArgumentException if {@code count < 0}.