fix(curriculum): Dead code example in (#46825)

fix(curriculum): Dead code example in #46813

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/using-objects-for-lookups.md

@@ -25,14 +25,14 @@ const alpha = {
   26:"A"
 };
 
-alpha[2];
-alpha[24];
+const thirdLetter = alpha[2];
+const lastLetter = alpha[24];
 
 const value = 2;
-alpha[value];
+const valueLookup = alpha[value];
 ```
 
-`alpha[2]` is the string `Y`, `alpha[24]` is the string `C`, and `alpha[value]` is the string `Y`.
+`thirdLetter` is the string `Y`, `lastLetter` is the string `C`, and `valueLookup` is the string `Y`.
 
 # --instructions--