Merge pull request #1946 from levonml/source

replace the value with the variable

Author: mluukkai

src/content/9/en/part9a.md

@@ -51,7 +51,7 @@ const birthdayGreeter = (name: string, age: number): string => {
 const birthdayHero = "Jane User";
 const age = 22;
 
-console.log(birthdayGreeter(birthdayHero, 22));
+console.log(birthdayGreeter(birthdayHero, age));
 ```
 
 #### Structural typing