RFR: 8325304: Several classes in java.util.jar and java.util.zip don't specify the behaviour for null arguments

[Jaikiran Pai]

Can I please get a review of this doc-only change which updates the javadoc of several classes in `java.util.jar` and `java.util.zip` to specify their behaviour when `null` arguments are passed to the constructor or methods of those classes?

For these updated classes, I have individually checked that they indeed throw a `NullPointerException` when `null` is passed to their constructor or methods. The couple of places where `null` is accepted have been updated to mention that `null` is allowed.

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Commit messages:
 - 8325304: Several classes in java.util.jar and java.util.zip don't specify the behaviour for null arguments

Changes: https://git.openjdk.org/jdk/pull/17728/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17728&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325304
  Stats: 75 lines in 15 files changed: 53 ins; 0 del; 22 mod
  Patch: https://git.openjdk.org/jdk/pull/17728.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17728/head:pull/17728

PR: https://git.openjdk.org/jdk/pull/17728