RFR: 8215788: Clarify JarInputStream Manifest access

[Lance Andersen]

On Fri, 26 Aug 2022 15:48:55 GMT, Lance Andersen <lancea at openjdk.org> wrote:

> Please review this PR which updates  the JarInputStream class description to clarify when the Manifest is accessible via JarInputStream::getManifest and JarInputStream::get[Jar]Entry.
> 
> It is worth noting that with this update, we are finally documenting  behavior that dates back to when this class was added to JDK 1.2
> 
> 
> Best,
> Lance

Max,

Thank you for your feedback.  See my responses below

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PR: https://git.openjdk.org/jdk/pull/10045