docs: Fix déja to déjà in swizzling.mdx (#10096)

Author: Zwyx

website/docs/swizzling.mdx

@@ -6,7 +6,7 @@ description: Customize your site's appearance through creating your own theme co
 
 In this section, we will introduce how customization of layout is done in Docusaurus.
 
-> Déja vu...?
+> Déjà vu...?
 
 This section is similar to [Styling and Layout](./styling-layout.mdx), but this time, we will customize React components themselves, rather than what they look like. We will talk about a central concept in Docusaurus: **swizzling**, which allows **deeper site customizations**.