RFR: 8332103: Add missing `@since` tags to `java.desktop`

[Tejesh R]

On Sat, 11 May 2024 17:52:28 GMT, Nizar Benalla <duke at openjdk.org> wrote:

> If you're currently reviewing this PR, thank you!
> Most fixes here are according to the reports by the since checker tool in #18934 and are pretty simple.
> 
> To make reviewing easier
> - `BasicSliderUI` has the constructor `public BasicSliderUI(JSlider b)` for a long time so the default constructor (without parameters) didn't exist until JDK 16
> 
> For the `package-info` files, it is pretty hard to find source code of JDK 1-5 so I used the `grep` command to find the oldest instance of an `@since` in those packages.
> 
> I found instances of `@since 1.1` in the other packages but `javax/swing/plaf/synth/package-info.java` might be worth checking as most classes there had no `@since`.

I did verify the updates against the release versions and looks good to me.

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Marked as reviewed by tr (Committer).

PR Review: https://git.openjdk.org/jdk/pull/19192#pullrequestreview-2054975318