Add explanation for potential SyntaxError in convertToPercentage function

Author: moses77-boop

Sprint-3/1-key-errors/1.js

@@ -3,10 +3,12 @@
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
+//An error will occur because 'const decimalNumber = 0.5' clashes with the parameter of the same name. 
 
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
+  // 
   const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;