Some small doc changes. The changes are to `@apiNote` text, which is non-normative, so no CSR is required.
------------- Commit messages: - 8228615: Optional.empty() doc should suggest isEmpty() instead of isPresent() Changes: https://git.openjdk.java.net/jdk/pull/1585/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1585&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8228615 Stats: 12 lines in 4 files changed: 0 ins; 0 del; 12 mod Patch: https://git.openjdk.java.net/jdk/pull/1585.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/1585/head:pull/1585 PR: https://git.openjdk.java.net/jdk/pull/1585
