Fix a typo (#1344)

Seems like the MyErrorBoundary import statement has a typo

content/docs/code-splitting.md

@@ -194,7 +194,7 @@ function MyComponent() {
 If the other module fails to load (for example, due to network failure), it will trigger an error. You can handle these errors to show a nice user experience and manage recovery with [Error Boundaries](/docs/error-boundaries.html). Once you've created your Error Boundary, you can use it anywhere above your lazy components to display an error state when there's a network error.
 
 ```js
-import MyErrorBoundary from '/MyErrorBoundary';
+import MyErrorBoundary from './MyErrorBoundary';
 const OtherComponent = React.lazy(() => import('./OtherComponent'));
 const AnotherComponent = React.lazy(() => import('./AnotherComponent'));