message: Replaced javascript extension of code block with js in mdx file
diff: @@ -45,7 +45,7 @@ However, one drawback with the way React and its hooks like _useEffect_ [work](h
  The following skeleton illustrates the mechanism.
  -```javascript
  +```js
  ParentComponent = () => {
  useEffect(() => {
  // this effect will be triggered in position 3
  @@ -112,7 +112,7 @@ Moreover those 2 "main" components will "expose" whatever functions the user wan
  Here's a squeleton of what the final structure would be like:
  -```javascript
  +```js
  MainComponent = (props) => {
  // Creates the first reference and instanciate a ParentComponent
  return (
  