Fix for-loop ellipses in code listings

Also add changelog entry for fixed light code introduction order.

Author: hollasch

CHANGELOG.md

@@ -12,6 +12,8 @@ Change Log -- Ray Tracing in One Weekend
 ### The Next Week
 
 ### The Rest of Your Life
+  - Fix: Synchronize book and source for `cornell_box()` function.
+  - Fix: Introduction of light code was introduced out of sequence (#738, #740)
 
 
 ----------------------------------------------------------------------------------------------------

books/RayTracingTheRestOfYourLife.html

@@ -2117,8 +2117,9 @@
 
         color background(0,0,0);
 
-        for (int j ...) {
-            for (int i ...) {
+        for (int j = image_height-1; j >= 0; --j) {
+            std::cerr << "\rScanlines remaining: " << j << ' ' << std::flush;
+            for (int i = 0; i < image_width; ++i) {
                 ...
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ C++ highlight
                 pixel_color += ray_color(r, background, world, lights, max_depth);