Fix typo in exercise 6-4

The variable count is now properly incremented each time draw() is executed.

Author: multimentha

chp06_loops/exercise_06_04_global_vs_local/exercise_06_04_global_vs_local.pde

@@ -2,7 +2,7 @@
 // Daniel Shiffman
 // http://www.learningprocessing.com
 
-// Exercise 6-4: Predict the results of the following two 
+// Exercise 6-4: Predict the results of the following two
 // programs. Test your theory by running them.
 
 /*
@@ -20,7 +20,7 @@ void draw() {
 ________
 
 
-
+*/
 //SKETCH #2: Local "count"
 
 void setup() {
@@ -29,8 +29,9 @@ void setup() {
 
 void draw() {
   int count = 0;
-  count = count = 1;
+  count = count + 1;
   background(count);
 }
+/*
 ________
 */