[jdk21u-dev] RFR: 8335904: Fix invalid comment in ShenandoahLock

[Xiaolong Peng]

Trivial change to fix the wrong comment introduced by https://bugs.openjdk.org/browse/JDK-8331411, JDK-8331411 has been backported to jdk21.

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Commit messages:
 - Backport bb1f8a1698553d5962569ac8912edd0d7ef010dd

Changes: https://git.openjdk.org/jdk21u-dev/pull/882/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=882&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335904
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/882.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/882/head:pull/882

PR: https://git.openjdk.org/jdk21u-dev/pull/882