RFR: 8373010: Update starting-next-release.html after JDK-8372940

[Nizar Benalla]

Small doc-only change, the HTML file should have been updated as part of 8372940

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

Commit messages:
 - update starting-next-release.html

Changes: https://git.openjdk.org/jdk/pull/28631/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28631&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373010
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28631.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28631/head:pull/28631

PR: https://git.openjdk.org/jdk/pull/28631