This change brings the number of javadoc warnings back to 91 (to be fixed in
[JDK-8270996](https://bugs.openjdk.org/browse/JDK-8270996))
- adds missing information in `@param` tags
- adds `@SuppressWarnings("doclint:missing")` to `Skinnable` to silence the
warning due to [JDK-8325071](https://bugs.openjdk.org/browse/JDK-8325071)
- fixed an empty `<p>` in `Subscription`
- cleaned up unnecessary `@throws` in Filtered/SortedList
Q: Does this PR need a CSR?
-------------
Commit messages:
- cleanup
- 8325073: javadoc warnings: missing @param tags and other issues
Changes: https://git.openjdk.org/jfx/pull/1384/files
Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1384&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8325073
Stats: 203 lines in 68 files changed: 108 ins; 9 del; 86 mod
Patch: https://git.openjdk.org/jfx/pull/1384.diff
Fetch: git fetch https://git.openjdk.org/jfx.git pull/1384/head:pull/1384
PR: https://git.openjdk.org/jfx/pull/1384
