fix(learn): modified usage of words from argument to parameter based on the title (#40130)

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

@@ -12,12 +12,13 @@ Just like a regular function, you can pass arguments into an arrow function.
 ```js
 // doubles input value and returns it
 const doubler = (item) => item * 2;
+doubler(4); // returns 8
 ```
 
-If an arrow function has a single argument, the parentheses enclosing the argument may be omitted.
+If an arrow function has a single parameter, the parentheses enclosing the parameter may be omitted.
 
 ```js
-// the same function, without the argument parentheses
+// the same function, without the parameter parentheses
 const doubler = item => item * 2;
 ```
 
@@ -26,6 +27,7 @@ It is possible to pass more than one argument into an arrow function.
 ```js
 // multiplies the first input value by the second and returns it
 const multiplier = (item, multi) => item * multi;
+multiplier(4, 2); // returns 8
 ```
 
 </section>