RFR: 8331873: Improve/expand info in `New API In` on Help page [v3]

[Nizar Benalla]

> This PR supersedes #19222, I've resolved the merge conflicts and updated the text based on review comments.

Nizar Benalla has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains eight additional commits since the last revision:

 - wrap lines
 - Merge remote-tracking branch 'upstream/master' into new-api-help-page
 - Update TestNewApiList
 - Update according to feedback
 - Merge branch 'master' into new-api-help-page
 - QOL change - change "all" to "toggle all" in the new-list and deprecated-list pages
 - fix merge conflicts and slight refactor due to 8335122
 - 8331873: Improve/expand info in `New API In` on Help page.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/23269/files
  - new: https://git.openjdk.org/jdk/pull/23269/files/128ada03..e38d1ffd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23269&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23269&range=01-02

  Stats: 10472 lines in 895 files changed: 6347 ins; 995 del; 3130 mod
  Patch: https://git.openjdk.org/jdk/pull/23269.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23269/head:pull/23269

PR: https://git.openjdk.org/jdk/pull/23269