Add detailed breakdown comment for Math.random in 4-random.js

Author: moses77-boop

Sprint-2/1-key-exercises/4-random.js

@@ -10,4 +10,5 @@ const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 
 //Solution
 //- "num" represents a random whole number between 1 and 100.
-//Break down of expression
+//Break down of expression
+//-Math.random: This generates a random decimal number between 0 and 1. It can return 0, but never reaches 1. (Example: 0.87).