RFR: 8261670: Add javadoc for the XML processing limits [v4]

[Iris Clark]

On Mon, 1 Mar 2021 23:59:11 GMT, Joe Wang <joehw at openjdk.org> wrote:

>> Add the documentation for XML processing limits to module summary. The limits were previously documented in Java tutorial and guide.
>
> Joe Wang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Change the description of the property table to indicate that the list of the properties is not exhaustive

Marked as reviewed by iris (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/2732