RFR: 8347063: Add comments in ClassFileFormatVersion for class file format evolution history [v2]

[Chen Liang]

> `javax.lang.model.SourceVersion` has a series of comments describing the new language features present in each source version. Similar comments for the `ClassFileFormatVersion` would be helpful, so readers no longer need to search through the JVMS to find changes in new versions.

Chen Liang has updated the pull request incrementally with one additional commit since the last revision:

  Add JEP/JSR numbers, clarify if something is attribute/modifier/etc.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22934/files
  - new: https://git.openjdk.org/jdk/pull/22934/files/77a723b8..13396297

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22934&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22934&range=00-01

  Stats: 26 lines in 1 file changed: 6 ins; 0 del; 20 mod
  Patch: https://git.openjdk.org/jdk/pull/22934.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22934/head:pull/22934

PR: https://git.openjdk.org/jdk/pull/22934