RFR: JDK-8266856 Make <wbr> element void [v3]

[Iris Clark]

On Thu, 20 May 2021 15:23:40 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:
> 
>   update test

Marked as reviewed by iris (Reviewer).

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