RFR: 8330182: Start of release updates for JDK 24 [v2]

[Joe Darcy]

> Get JDK 24 underway.

Joe Darcy has updated the pull request incrementally with two additional commits since the last revision:

 - Correct release date as observed in review feedback.
 - Improve javadoc of class file update.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18787/files
  - new: https://git.openjdk.org/jdk/pull/18787/files/dcec9e96..dc488f21

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18787&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18787&range=00-01

  Stats: 5 lines in 2 files changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/18787.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18787/head:pull/18787

PR: https://git.openjdk.org/jdk/pull/18787