Improve comments in existing transformation demos

Author: nicolaiparlog

src/demo/java/org/codefx/libfx/collection/transform/EqualityTransformingSetDemo.java

@@ -39,6 +39,9 @@ public static void main(String[] args) {
 	}
 
 	private void addSomeElements() {
+		print("-- Adding some elements --");
+		print();
+
 		lengthSet.add("a");
 		lengthSet.add("b");
 		print(lengthSet.toString());

src/demo/java/org/codefx/libfx/collection/transform/OptionalTransformingSetDemo.java

@@ -15,10 +15,13 @@ public class OptionalTransformingSetDemo {
 	// #begin FIELDS
 
 	/**
-	 * The inner set, which - for some strange
+	 * The inner set, which - for some strange reason - contains {@link Optional}s.
 	 */
 	private final Set<Optional<String>> innerSet;
 
+	/**
+	 * The transformation without {@link Optional}.
+	 */
 	private final Set<String> transformingSet;
 
 	// #end FIELDS

src/demo/java/org/codefx/libfx/collection/transform/TransformingSetDemo.java

@@ -22,7 +22,7 @@ public class TransformingSetDemo {
 	private final Set<String> innerSet;
 
 	/**
-	 * A view ion the set which uses integers instead.
+	 * A view on the set which uses integers instead.
 	 */
 	private final Set<Integer> transformingSet;