RFR: 8372850: Update comment in SourceVersion for language evolution history for changes in 26 [v3]

[Joe Darcy]

> Include source-level comments about per-release language changes, or lack thereof.

Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:

  Respond to more review feedback.

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/28594/files
  - new: https://git.openjdk.org/jdk/pull/28594/files/bec28d31..cfa5e8d3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28594&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28594&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/28594.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28594/head:pull/28594

PR: https://git.openjdk.org/jdk/pull/28594