RFR: 8356128: Correct documentation for --linux-package-deps

[Stefan Lobbenmeier]

The documentation suggests that --linux-package-deps is a boolean option, while in fact it is a string option with dependencies separated by comma and space

You can tell that this option is supposed to have an argument here: https://github.com/openjdk/jdk/blob/fea5f2b1458cdd53f437e59caaffaa6e22fb59a7/src/jdk.jpackage/linux/classes/jdk/jpackage/internal/LinuxPackageBundler.java#L366-L372

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Commit messages:
 - Use the same syntax as for --mac-dmg-content
 - Correct documentation for --linux-package-deps

Changes: https://git.openjdk.org/jdk/pull/23638/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23638&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356128
  Stats: 5 lines in 5 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/23638.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23638/head:pull/23638

PR: https://git.openjdk.org/jdk/pull/23638