[orx-fx] Add comments to demos

orx-fx/src/jvmDemo/kotlin/DemoDistortLenses01.kt

@@ -3,6 +3,12 @@ import org.openrndr.draw.createEquivalent
 import org.openrndr.draw.loadImage
 import org.openrndr.extra.fx.distort.Lenses
 
+/**
+ * Demonstrates the [Lenses] effect, which by default subdivides a color buffer
+ * in 8 columns and 6 rows, and displaces the source texture inside each rectangle.
+ * Try experimenting with some of the other parameters, like `distort`.
+ * You can even animate them.
+ */
 fun main() = application {
     configure {
         width = 640
@@ -14,7 +20,7 @@ fun main() = application {
         val lenses = Lenses()
         val edges = image.createEquivalent()
         extend {
-            lenses.rotation = 0.0
+            lenses.rotation = 30.0
             lenses.scale = 1.5
 
             lenses.apply(image, edges)