In `PreviewFeature.Feature`, there is a `LANGUAGE_MODEL` for general support of preview features, currently used by `javax.lang` tree visitors. This is confusing as JEP 401 [incorrectly marked](https://github.com/openjdk/valhalla/pull/2533#discussion_r3391007566) a new language modifier as a `LANGUAGE_MODEL` preview feature API. This "feature" is better renamed `PREVIEW_SUPPORT` to reduce confusions.
--------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - Update occurrence in javadoc test - Merge branch 'master' of https://github.com/openjdk/jdk into cleanup/preview-feature-support - Rename LANGUAGE_MODEL to PREVIEW_SUPPORT Changes: https://git.openjdk.org/jdk/pull/31504/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=31504&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8386601 Stats: 24 lines in 11 files changed: 12 ins; 0 del; 12 mod Patch: https://git.openjdk.org/jdk/pull/31504.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/31504/head:pull/31504 PR: https://git.openjdk.org/jdk/pull/31504
