This PR implements JEP 413 "Code Snippets in Java API Documentation", which hasn't been yet proposed to target JDK 18. The PR starts as a squashed merge of the https://github.com/openjdk/jdk-sandbox/tree/jdk.javadoc/snippets branch.
------------- Commit messages: - Update copyright years - Do not use snippets - Initial commit Changes: https://git.openjdk.java.net/jdk/pull/4795/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4795&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8266666 Stats: 4603 lines in 44 files changed: 4575 ins; 4 del; 24 mod Patch: https://git.openjdk.java.net/jdk/pull/4795.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/4795/head:pull/4795 PR: https://git.openjdk.java.net/jdk/pull/4795
