RFR: 8372850: Update comment in SourceVersion for language evolution history for changes in 26 [v2]

[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 review feedback.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28594/files
  - new: https://git.openjdk.org/jdk/pull/28594/files/5178cf5b..bec28d31

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28594&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28594&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 2 del; 2 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