RFR: JDK-8305094: typo (missing *) in doc comment

[Jonathan Gibbons]

Please review a trivial patch to fix a typo in a recent update

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Commit messages:
 - JDK-8305094: typo (missing *) in doc comment

Changes: https://git.openjdk.org/jdk/pull/13210/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13210&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305094
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13210.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13210/head:pull/13210

PR: https://git.openjdk.org/jdk/pull/13210