[jdk20] RFR: JDK-8277074: Qualified exported types show up in JavaDoc

Mon Dec 19 16:35:32 UTC 2022

This `noreg-doc` PR has been moved over from the mainline repository, the original PR is openjdk/jdk#11163. 

The purpose is to hide internal classes in generated documentation by adding doc comments containing a @hidden tag. I verified the fix by making sure the internal vector and event classes no longer show up in the generated documentation tree.

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Commit messages:
 - JDK-8277074: Qualified exported types show up in JavaDoc

Changes: https://git.openjdk.org/jdk20/pull/56/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20&pr=56&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8277074
  Stats: 14 lines in 2 files changed: 14 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk20/pull/56.diff
  Fetch: git fetch https://git.openjdk.org/jdk20 pull/56/head:pull/56

PR: https://git.openjdk.org/jdk20/pull/56