Trivial improvement. Explicitly show how to create a `Cleaner` instance using `Cleaner.create()`. Repeat (again) in the code example that the `State` `Runnable `should be implemented as static class and not reference the instance to be cleaned, to make the point even more clear to those people who never read the javadoc *prose*.
I have signed the OCA a while back as [hschreiber](https://openjdk.java.net/census#hschreiber). ------------- Commit messages: - Improved java.lang.ref.Cleaner javadocs. Changes: https://git.openjdk.java.net/jdk/pull/6076/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6076&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8276700 Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod Patch: https://git.openjdk.java.net/jdk/pull/6076.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/6076/head:pull/6076 PR: https://git.openjdk.java.net/jdk/pull/6076
