RFR: 8292488: Incorrect comment in ActiveRecordingEvent

[chigiriki]

please review this change.
I checked the build succecfully just in case. No error occured.

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Commit messages:
 - 8292488: Incorrect comment in ActiveRecordingEvent

Changes: https://git.openjdk.org/jdk/pull/9897/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9897&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292488
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9897.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9897/head:pull/9897

PR: https://git.openjdk.org/jdk/pull/9897