RFR: 8268642: Expand the javafx.beans.property.Property documentation

[Nir Lisker]

On Mon, 14 Jun 2021 17:06:34 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

> * Expand the `Property.bind` and `Property.bindBidirectional` documentation
> * Change the name of the formal parameter of `Property.bind` to "source" (currently, it is inconsistently named "observable", "rawObservable" or "newObservable")

I will review this.

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PR: https://git.openjdk.java.net/jfx/pull/533