contents(js): fix spread syntax typo (#19)

Co-authored-by: Aziz <[email protected]>
Co-authored-by: Yangshun Tay <[email protected]>

Author: 3 people

questions/what-are-the-benefits-of-using-spread-syntax-and-how-is-it-different-from-rest-syntax/en-US.mdx

@@ -66,8 +66,8 @@ const obj2 = {
   qux: 'baz',
 };
 
-const merged = { ...obj1, ...obj2 };
-console.log(merged); // Output: { foo: "bar", qux: "baz" }
+const mergedObj = { ...obj1, ...obj2 };
+console.log(mergedObj); // Output: { foo: "bar", qux: "baz" }
 ```
 
 ### Passing arguments to functions