RFR: 8247957: remove doclint support for HTML 4 [v3]

[Yoshiki Sato]

On Thu, 17 Dec 2020 04:58:21 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Yoshiki Sato has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:
>> 
>>   8257204 and 8256313
>>   8257204: Remove usage of -Xhtmlversion option from javac
>>   8256313: JavaCompilation.gmk needs to be updated not to use --doclint-format html5 option
>
> Mostly OK; some minor suggestions

Some related changes to 8258460 in closed repo is here.
https://orahub.oci.oraclecorp.com/yoshiki_sato/jdk/-/merge_requests/new?merge_request%5Bsource_branch%5D=JDK-8247957_2

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PR: https://git.openjdk.java.net/jdk/pull/893