Miiiiiiiiiiiiiiiiiinor spelling mistake

Author: FoxDavoid

apps/docs/src/themes/basics/structure.md

@@ -32,5 +32,5 @@ As you'd likely imagine, with `UseDefaultPatches`:
 
 -   **bigpicture.custom.css** & **bigpicture.custom.js** are inserted into the Steam Big Picture window.
 -   **friends.custom.css** & **friends.custom.js** are inserted into the Steam Friends List.
--   **libraryroot.custom.css**& **libraryroot.custom.js** are inserted into the main Steam window.
+-   **libraryroot.custom.css** & **libraryroot.custom.js** are inserted into the main Steam window.
 -   **webkit.css** is loaded into all Steam web views (Store, Community, etc.)