Fix inconsistent formatting of the welcomeToBooleans function (#34373)

fix the inconsistency in the formatting of the function and also fix issue #34367

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-boolean-values.english.md

@@ -37,11 +37,11 @@ tests:
 ```js
 function welcomeToBooleans() {
 
-// Only change code below this line.
+  // Only change code below this line.
 
-return false; // Change this line
+  return false; // Change this line
 
-// Only change code above this line.
+  // Only change code above this line.
 }
 ```