RFR: 8357018: Guidance for ParallelRefProcEnabled is wrong in the man pages

[Thomas Schatzl]

Hi all,

  please review this small update to the parallel reference processing option in the manpage.

Testing: compilation/manpage building?

Thomas

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Commit messages:
 - 8357018

Changes: https://git.openjdk.org/jdk/pull/25323/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25323&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357018
  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25323.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25323/head:pull/25323

PR: https://git.openjdk.org/jdk/pull/25323