This PR proposes adding `@sealedGraph` to `GroupLayout` so the latter will be rendered in the javadocs the same way the other layouts that has public sub-interfaces.
------------- Commit messages: - Add @sealedGraph to GroupLayout Changes: https://git.openjdk.org/jdk/pull/14449/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14449&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8309937 Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/14449.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/14449/head:pull/14449 PR: https://git.openjdk.org/jdk/pull/14449
