TabPane: Redundant API docs

See JDK-8271083 for a general description.

The TabPane class has redundant documentation on several elements. Specifically, there are two properties that have javadoc comments on both the field and the Property method, and there are several properties (including those two) that have javadoc comments on the setter or getter.

The two things that need to be done for this bug are:

* Docs should be only on the field or the Property method (not both)
    tabMaxWidth, tabMaxWidthProperty() : remove docs on Property method
    tabMaxHeight, tabMaxHeightProperty() : remove docs on Property method

* Remove unnecessary docs on setters and getters

For each property, the most complete information should be taken. For example, tabClosingPolicy should take most of its documentation from the setter (which should be moved to either the field or the Property method).