RFR: 8326687: Inconsistent use of "ZIP", "Zip" and "zip" in java.util.zip/jar zipfs javadoc

[Lance Andersen]

This PR updates the javadoc and comments within java.util.zip/jar and zipfs module summary so that it is consistent with the use of "ZIP".

In addition, open/src/java.base/share/classes/java/util/zip/package-info.java has been updated to point to the higher level location of the PKWARE APPNOTE.TXT has PKWare recently changed the direct path the the latest version of the spec.

It is also worth noting that error messages were not updated as part of the PR and will be updated separately to keep the javadoc changes separate

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Commit messages:
 - Initial update for JDK-8326687

Changes: https://git.openjdk.org/jdk/pull/18011/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18011&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326687
  Stats: 113 lines in 9 files changed: 0 ins; 0 del; 113 mod
  Patch: https://git.openjdk.org/jdk/pull/18011.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18011/head:pull/18011

PR: https://git.openjdk.org/jdk/pull/18011