Add link to DoD talk in 101_for5.zig

exercises/101_for5.zig

@@ -84,7 +84,7 @@ pub fn main() void {
 // use a marble scoop, spoon magnet, and feather tongs to grab
 // each type of object.
 //
-// Now, would you rather the magic bag:
+// Now, would you rather use the magic bag:
 //
 // A. Grouped the items in clusters so you have to pick up one
 //    marble, then one spoon, then one feather?
@@ -95,7 +95,7 @@ pub fn main() void {
 //    marbles at once, then all the spoons, then all of the
 //    feathers?
 //
-// If this metaphor is working, hopefully it's clear that the 'B'
+// If this metaphor is working, hopefully, it's clear that the 'B'
 // option would be much more efficient.
 //
 // Well, it probably comes as little surprise that storing and
@@ -120,3 +120,7 @@ pub fn main() void {
 // three arrays of one data type each, like those in the exercise
 // above (SoA).
 //
+// For a more practical application of "data-oriented design"
+// watch the following talk from Andrew Kelley, the creator of Zig:
+// https://vimeo.com/649009599
+//