[jdk18] RFR: JDK-8278538: Test langtools/jdk/javadoc/tool/CheckManPageOptions.java fails after the manpage was updated

[Jonathan Gibbons]

Please review a fix to update this test to match the latest man page

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Commit messages:
 - JDK-8278538: Test langtools/jdk/javadoc/tool/CheckManPageOptions.java fails after the manpage was updated

Changes: https://git.openjdk.java.net/jdk18/pull/8/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk18&pr=8&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278538
  Stats: 11 lines in 1 file changed: 0 ins; 9 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk18/pull/8.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18 pull/8/head:pull/8

PR: https://git.openjdk.java.net/jdk18/pull/8