RFR: 8340885: Desugar ZipCoder.Comparison

[Claes Redestad]

This PR desugars the enum added by JDK-8301873 to reduce classes loaded on bootstrap and stored in the default CDS archive by 2.

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Commit messages:
 - Fix docs
 - Merge branch 'master' into no-comparison
 - Desugar Comparison enum

Changes: https://git.openjdk.org/jdk/pull/21176/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21176&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340885
  Stats: 25 lines in 2 files changed: 0 ins; 1 del; 24 mod
  Patch: https://git.openjdk.org/jdk/pull/21176.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21176/head:pull/21176

PR: https://git.openjdk.org/jdk/pull/21176