RFR: JDK-8295071: Spec Clarification : ClassFileFormatVersion: System property java.class.version | Java class format version number [v4]

[Joe Darcy]

> Document existing behavior.
> 
> Please also review the CSR https://bugs.openjdk.org/browse/JDK-8309415

Joe Darcy has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - Respond to review feedback.
 - Merge branch 'master' into JDK-8295071
 - Respond to review feedback.
 - Merge branch 'master' into JDK-8295071
 - JDK-8309415: Spec Clarification : ClassFileFormatVersion: System property java.class.version | Java class format version number

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14305/files
  - new: https://git.openjdk.org/jdk/pull/14305/files/33bb646b..018a5dc2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14305&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14305&range=02-03

  Stats: 1867 lines in 57 files changed: 1607 ins; 39 del; 221 mod
  Patch: https://git.openjdk.org/jdk/pull/14305.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14305/head:pull/14305

PR: https://git.openjdk.org/jdk/pull/14305