RFR: 8215788: Clarify JarInputStream Manifest access

[Lance Andersen]

On Thu, 1 Sep 2022 13:53:05 GMT, Weijun Wang <weijun at openjdk.org> wrote:

> It's better. Do you need to explicitly say "For all other cases"?

I thought it is worth being specific,  but happy to leave it out if you and others prefer
> 
> My original comment was more about explaining `getManifest()` and `getNextEntry()` in the same if. It's still doable.

I think the challenge is there is not an exact match to the behavior between `getManifest()` and `getNext[Jar]Entry()`.    We also have the case if the manifest is the first entry and META-INF/ is the 2nd or later entry, then  META-INF/ will be returned by `JarInputStream`.  ` ZipInputStream` will return all entries which differs from `JarInputStream` so thought it made sense to be specific but perhaps I am overthinking it.

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