Increase language clarity in challenge "Basic Javascript: Iterate Through an Array with a For Loop" (#36081)

* Increase language clarity in the challenge.

* Update curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-through-an-array-with-a-for-loop.english.md

Co-Authored-By: Randell Dawson <5313213+RandellDawson@users.noreply.github.com>

* fix/make-suggested-changes-on-behalf-of-author

* fix/add-empty-line-back-in

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-through-an-array-with-a-for-loop.english.md

@@ -16,7 +16,7 @@ for (var i = 0; i < arr.length; i++) {
 }
 ```
 
-Remember that Arrays have zero-based numbering, which means the last index of the array is length - 1. Our <dfn>condition</dfn> for this loop is <code>i < arr.length</code>, which stops when <code>i</code> is at length - 1.
+Remember that arrays have zero-based indexing, which means the last index of the array is <code>length - 1</code>. Our condition for this loop is <code>i < arr.length</code>, which stops the loop when <code>i</code> is equal to <code>length</code>. In this case the last iteration is <code>i === 4</code> i.e. when <code>i</code> becomes equal to <code>arr.length</code> and outputs <code>6</code> to the console.
 </section>
 
 ## Instructions
@@ -30,21 +30,19 @@ Declare and initialize a variable <code>total</code> to <code>0</code>. Use a <c
 ```yml
 tests:
   - text: <code>total</code> should be declared and initialized to 0
-    testString: assert(code.match(/(var|let|const)\s*?total\s*=\s*0.*?;?/), '<code>total</code> should be declared and initialized to 0');
+    testString: assert(code.match(/(var|let|const)\s*?total\s*=\s*0.*?;?/));
   - text: <code>total</code> should equal 20
-    testString: assert(total === 20, '<code>total</code> should equal 20');
+    testString: assert(total === 20);
   - text: You should use a <code>for</code> loop to iterate through <code>myArr</code>
-    testString: assert(code.match(/for\s*\(/g).length > 1 && code.match(/myArr\s*\[/), 'You should use a <code>for</code> loop to iterate through <code>myArr</code>');
+    testString: assert(code.match(/for\s*\(/g).length > 1 && code.match(/myArr\s*\[/));
   - text: Do not set <code>total</code> to 20 directly
-    testString: assert(!code.match(/total[\s\+\-]*=\s*(0(?!\s*[;,]?$)|[1-9])/gm), 'Do not set <code>total</code> to 20 directly');
-
+    testString: assert(!code.match(/total[\s\+\-]*=\s*(0(?!\s*[;,]?$)|[1-9])/gm));
 ```
 
 </section>
 
 ## Challenge Seed
 <section id='challengeSeed'>
-
 <div id='js-seed'>
 
 ```js
@@ -61,12 +59,10 @@ var myArr = [ 2, 3, 4, 5, 6];
 
 // Only change code below this line
 
-
 ```
 
 </div>
 
-
 ### After Test
 <div id='js-teardown'>
 
@@ -82,7 +78,6 @@ var myArr = [ 2, 3, 4, 5, 6];
 ## Solution
 <section id='solution'>
 
-
 ```js
 var ourArr = [ 9, 10, 11, 12];
 var ourTotal = 0;