Minor cleanup of API docs in controls

There are a couple typos in ListView and one odd sentence in ScrollPane that should be cleaned up.

ListView:

1. Typo: If passying the ObservableList


2. The following is awkward (and not grammatically correct):

"making use of the generic supports substantially simplifies development of applications making use of ListView ..."

suggestion:

"making use of the generic type supports substantially simplified development of applications making use of ListView ..."

ScrollPane:

3. The last sentence of the class docs seems like a superfluous implementation note, not something relevant to users of the API:

"Implementation of ScrollPane According to JavaFX UI Control API Specification"