Made practice edits.

development-environment-homework/src/helloWorld.js

 export function helloWorld() {
   return [
-    'Hello,',
-    'World!',
+    1,
   ];
 }

development-environment-homework/src/helloWorld.test.js

@@ -9,8 +9,7 @@ describe('the JavaScript language', () => {
 describe('the hello-world function', () => {
   test('returns the correct string', () => {
     expect(helloWorld()).toEqual([
-      'Hello,',
-      'World!',
+      1,
     ]);
   });
 });