RFR: JDK-8266856 Make <wbr> element void [v2]

[Jonathan Gibbons]

On Wed, 19 May 2021 18:58:17 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Please review a simple fix to treat `wbr` as a void element.
>
> Jonathan Gibbons has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add test

Added test.
Further out, we should try and come up with a javadoc-internal HTML package  that contains
   the intersection of  (the union of the requirements of doclint and the HTML doclet) and the HTML specification, as defined by WhatWG
... meaning, there are some common aspects that can be shared, and that there are some aspects that are specific to doclint and to the HmlDoclet.

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PR: https://git.openjdk.java.net/jdk/pull/4098