RFR: 8261670: Add javadoc for the XML processing limits [v3]

[Lance Andersen]

On Fri, 26 Feb 2021 08:04:02 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:
> 
>   s/NumericFormatException/NumberFormatException, remove default id

Looks good Joe.  Added myself as a reviewer to the CSR as well

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Marked as reviewed by lancea (Reviewer).

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