RFR: 8361698: Fix obsolete comments in Klass::clean_weak_klass_links()

[Thomas Schatzl]

Hi all,

  please review this fix to some comments in the Klass::clean_weak_klass_links() after the changes in JDK-8213209. I believe this is a trivial change.

Testing: local compilation

Thanks,
  Thomas

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Commit messages:
 - 8361698

Changes: https://git.openjdk.org/jdk/pull/26219/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26219&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361698
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/26219.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26219/head:pull/26219

PR: https://git.openjdk.org/jdk/pull/26219