RFR: 8314753: Remove support for @beaninfo, @ToDo, @since.unbundled, and @Note

[Pavel Rappo]

Please review this trivial PR.

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/15385/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15385&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314753
  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15385.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15385/head:pull/15385

PR: https://git.openjdk.org/jdk/pull/15385