Release Note: JEP 413: Code Snippets in Java API Documentation

An @snippet tag for JavaDoc's Standard Doclet has been added, to simplify the inclusion of example source code in API documentation.

For further details, see [JEP 413](https://openjdk.java.net/jeps/413)
and
[A Programmmer's Guide to Snippets](https://docs.us.oracle.com/en/java/javase/18/code-snippet/index.html).