RFR: JDK-8281445: Document the default value for the override-methods option

[Jonathan Gibbons]

Please refer a trivial update for the javadoc command-line help, to specify the default value for the --override-methods option.

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Commit messages:
 - JDK-8281445: Document the default value for the override-methods option

Changes: https://git.openjdk.org/jdk19/pull/2/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk19&pr=2&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8281445
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk19/pull/2.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/2/head:pull/2

PR: https://git.openjdk.org/jdk19/pull/2