For some reason, we never turned on `-Werror` for javadoc. It is high time to do so.
This PR also fixes a recent issue with the javadoc in JFR that caused a warning, and enables building of javadoc on GHA. (It takes about 3 minutes, as a separate build job.) ------------- Commit messages: - *sigh* Can't build just release, due to limitations in GHA :( - Move docs into a separate build step - 8297984: Turn on warnings as errors for javadoc Changes: https://git.openjdk.org/jdk/pull/11468/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11468&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8297984 Stats: 25 lines in 3 files changed: 23 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/11468.diff Fetch: git fetch https://git.openjdk.org/jdk pull/11468/head:pull/11468 PR: https://git.openjdk.org/jdk/pull/11468
