Fix javadoc errors in DefaultLauncherIcon, Launcher, and Application classes. Additionally, add javadoc to some methods of PackagingPipeline class.
------------- Commit messages: - DefaultLauncherIcon: minor javadoc fix - Add javadoc to PackagingPipeline - Launcher, Application: fix javadoc Changes: https://git.openjdk.org/jdk/pull/26609/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26609&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8364587 Stats: 35 lines in 4 files changed: 30 ins; 0 del; 5 mod Patch: https://git.openjdk.org/jdk/pull/26609.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/26609/head:pull/26609 PR: https://git.openjdk.org/jdk/pull/26609
