Can I please get a review for this change, that aims to add support for Global HTML tags. Here is the [link](https://cr.openjdk.org/~nbenalla/javadocGlobalAttrs/pkg1/package-summary.html) to the generated docs. Thanks in advance.
------------- Commit messages: - Allow global variables Changes: https://git.openjdk.org/jdk/pull/19652/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19652&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8322708 Stats: 613 lines in 5 files changed: 610 ins; 0 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/19652.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/19652/head:pull/19652 PR: https://git.openjdk.org/jdk/pull/19652
