docs: fix typo (#720)

docs/content/1.getting-started/1.setup.md

@@ -67,7 +67,7 @@ You can configure the paths in the [module options](/getting-started/options).
 
 If you're going to create your own Tailwind CSS file, make sure to add the `@tailwind` directives for each of Tailwind’s layer types (base, components, and utilities).
 
-```css [~/assets/css/tailwind.csss]
+```css [~/assets/css/tailwind.css]
 @tailwind base;
 @tailwind components;
 @tailwind utilities;