ES6 Modules: Clarified string declaration in import statements (#28051)

* clarified string declaration in import statements

* changed wording

* grammar correct, quotes not quote

javascript/organizing_your_javascript_code/es6_modules.md

@@ -83,6 +83,7 @@ export { functionOne };
 
 ```javascript
 // another JS file
+// Note: You can only use single quotes (') or double quotes (") for import statements 
 import { functionOne } from './functionOne';
 
 functionOne(); // this should work as expected!