[jfx15] RFR: 8246343: Fix mistakes in FX API docs

[Kevin Rushforth]

On Sat, 25 Jul 2020 17:38:30 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Fixes https://bugs.openjdk.java.net/browse/JDK-8246343 and some additional fixes in the vicinity.
>
> modules/javafx.fxml/src/main/docs/javafx/fxml/doc-files/introduction_to_fxml.html line 723:
> 
>> 722: <span class="code">ObservableList</span>, <span class="code">ObservableMap</span> or <span
>> class="code">ObservableSet</span> 723:  uses a special <span class="code">onChange</span> attribute that points to a
>> handler method with a <span class="code">ListChangeListner</span>, <span class="code">MapChangeListener</span> or <span
>> class="code">SetChangeListener</span> parameter, respectively. 724: </p>
> 
> ListChangeListner --> ListChangeListener

Also, the `.Change` was correct before your fix, unless I'm missing something.

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PR: https://git.openjdk.java.net/jfx/pull/274