fix: update comments to clarify the use of const and suggest using let for reassignment

Author: alexandru-pocovnicu

Sprint-1/2-mandatory-errors/1.js

@@ -3,4 +3,5 @@
 const age = 33;
 age = age + 1;
 //the "age" variable has been declared with a const and already assigned a value and it can not 
-// be reassigned another value because of the "const"
+// be reassigned another value because of the "const"
+// "age" should be declared with "let"  to be able to change it's value