Add `package-info.java` for package `jdk.nio.mapmode`. -------------
Commit messages: - 8310682: No package-info (and @since) for package jdk.nio.mapmode Changes: https://git.openjdk.org/jdk/pull/14628/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14628&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8310682 Stats: 33 lines in 1 file changed: 33 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/14628.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/14628/head:pull/14628 PR: https://git.openjdk.org/jdk/pull/14628
