fix(curriculum): Consolidated comments for JavaScript Algorithms and Data Structures challenges - part 2 of 4 (#38259)

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/complete-a-promise-with-resolve-and-reject.english.md

@@ -50,9 +50,9 @@ const makeServerRequest = new Promise((resolve, reject) => {
   let responseFromServer;
 	
   if(responseFromServer) {
-    // change this line
+    // Change this line
   } else {	
-    // change this line
+    // Change this line
   }
 });
 ```

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-the-spread-operator-to-evaluate-arrays-in-place.english.md

@@ -62,7 +62,7 @@ tests:
 const arr1 = ['JAN', 'FEB', 'MAR', 'APR', 'MAY'];
 let arr2;
 
-arr2 = [];  // change this line
+arr2 = [];  // Change this line
 
 console.log(arr2);
 ```

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-arrow-functions-with-parameters.english.md

@@ -65,7 +65,7 @@ var myConcat = function(arr1, arr2) {
   "use strict";
   return arr1.concat(arr2);
 };
-// test your code
+
 console.log(myConcat([1, 2], [3, 4, 5]));
 ```
 
@@ -83,7 +83,7 @@ const myConcat = (arr1, arr2) =>  {
   "use strict";
   return arr1.concat(arr2);
 };
-// test your code
+
 console.log(myConcat([1, 2], [3, 4, 5]));
 ```