Update beginShape_10.pde

fixes #327

Author: SableRaf

content/references/examples/processing/beginShape_/beginShape_10.pde

@@ -1,6 +1,8 @@
 beginShape();
 vertex(120, 80);
-vertex(340, 80);
+vertex(230, 80);
+vertex(230, 190);
+vertex(340, 190);
 vertex(340, 300);
 vertex(120, 300);
 endShape(CLOSE);