JavadocFormatter Edits

Hey Jim,

These are the `JavadocFormatter` edits we talked about. The JF now skips third party modules and no longer duplicates Javadoc that was mistakenly placed with vertical space between it and the method/class.

cc/ @mtambara

https://issues.liferay.com/browse/LRDOCS-1459
https://issues.liferay.com/browse/LRDOCS-1481