Improve formatting of CheckboxWidget docs

The \define() calls that are short enough to fit on one line should be
put on one line, for readability. The ones that are quite long have been
kept on multiple lines, for readability.

editions/tw5.com/tiddlers/widgets/CheckboxWidget.tid

@@ -6,13 +6,8 @@ colors: red orange yellow blue
 title: CheckboxWidget
 type: text/vnd.tiddlywiki
 
-\define checkActions()
-<$action-listops $field="colors" $subfilter="-red green"/>
-\end
-
-\define uncheckActions()
-<$action-listops $field="colors" $subfilter="red -green"/>
-\end
+\define checkActions() <$action-listops $field="colors" $subfilter="-red green"/>
+\define uncheckActions() <$action-listops $field="colors" $subfilter="red -green"/>
 
 \define filterExample()
 <$checkbox filter="[list[!!colors]]" checked="green" unchecked="red" default="red" checkactions=<<checkActions>> uncheckactions=<<uncheckActions>> > Is "green" in colors?</$checkbox><br />''colors:'' {{!!colors}}