RFR: 8364587: Update jpackage internal javadoc

[Alexander Matveev]

On Sun, 3 Aug 2025 23:08:17 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

> Fix javadoc errors in DefaultLauncherIcon, Launcher, and Application classes. Additionally, add javadoc to some methods of PackagingPipeline class.

Looks good.

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Marked as reviewed by almatvee (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26609#pullrequestreview-3086227545