RFR: 8306055: Add a built-in Catalog to JDK XML module [v3]

[Alan Bateman]

On Mon, 20 Nov 2023 17:46:53 GMT, Joe Wang <joehw at openjdk.org> wrote:

>> Implement the built-in Catalog.
>
> Joe Wang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add a note; fix alignment

I'm happy with the addition of the JDK built-in catalog, the inclusion of the DTD defined by Java SE, and the docs updates.

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Marked as reviewed by alanb (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16719#pullrequestreview-1743867203