The specification of the modules API contains several non-normative code examples. We should convert them to use snippets, per [JEP 413](https://openjdk.org/jeps/413).
------------- Commit messages: - 8291512: Snippetize modules API examples Changes: https://git.openjdk.org/jdk19/pull/156/files Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=156&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8291512 Stats: 22 lines in 4 files changed: 2 ins; 9 del; 11 mod Patch: https://git.openjdk.org/jdk19/pull/156.diff Fetch: git fetch https://git.openjdk.org/jdk19 pull/156/head:pull/156 PR: https://git.openjdk.org/jdk19/pull/156
