As the API has improved over the recent releases, not all `{@snippet ..}`
sections have been kept in sync.
This PR suggests all snippets used should be verified against real code that is
placed in a new `snippet-files` folder and erroneous snippets are updated.
-------------
Commit messages:
- Reformat
- Remove file
- Add a snippet-files class with snippets
Changes: https://git.openjdk.org/jdk/pull/14030/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14030&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8308281
Stats: 714 lines in 7 files changed: 679 ins; 1 del; 34 mod
Patch: https://git.openjdk.org/jdk/pull/14030.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/14030/head:pull/14030
PR: https://git.openjdk.org/jdk/pull/14030
