RFR: 8251495: Clarify DOM documentation

[Joe Wang]

On Thu, 10 Sep 2020 16:16:57 GMT, Joe Wang <joehw at openjdk.org> wrote:

>> Marked as reviewed by alanb (Reviewer).
>
> Remove the implNote from the package description added by JDK-8249643.
> The implementation's deviation from the specification was actually wrong.
> It incorrectly identified characters from #x10000 to #x10FFFF as in the
> surrogate blocks.

Remove the implNote from the package description added by JDK-8249643.

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PR: https://git.openjdk.java.net/jdk/pull/100