Cleaning examples for Beta launch

java/examples/Basics/Arrays/Array2D/Array2D.pde

@@ -27,6 +27,10 @@ void setup() {
 
 void draw() {
   background(0);
+  // This embedded loop skips over values in the arrays based on
+  // the spacer variable, so there are more values in the array
+  // than are drawn here. Change the value of the spacer variable
+  // to change the density of the points
   for (int y = 0; y < height; y += spacer) {
     for (int x = 0; x < width; x += spacer) {
       stroke(distances[x][y]);