RFR: 8215788: Clarify JarInputStream Manifest access [v12]

[Lance Andersen]

> 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

Lance Andersen has updated the pull request incrementally with one additional commit since the last revision:

  Added the verification note from JarFile

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10045/files
  - new: https://git.openjdk.org/jdk/pull/10045/files/4c4c2a06..18f7e5dc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10045&range=11
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10045&range=10-11

  Stats: 8 lines in 1 file changed: 8 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10045.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10045/head:pull/10045

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