[jdk21u] RFR: 8318957: enhance agentlib:jdwp help output by info about allow option

[Matthias Baesken]

8318957: enhance agentlib:jdwp help output by info about allow option

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Commit messages:
 - Backport 53bb7cd415f1d2e87d8f06ad5eb611bfdf8ef0ad

Changes: https://git.openjdk.org/jdk21u/pull/378/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=378&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318957
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u/pull/378.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/378/head:pull/378

PR: https://git.openjdk.org/jdk21u/pull/378