Update frontend.rst

Co-authored-by: Wouter de Jong <[email protected]>

Author: ThomasLandauer

frontend.rst

@@ -29,10 +29,10 @@ Supports React, Vue, Svelte?      yes                yes*
 Supports TypeScript               yes                no*
 ================================  =================  ======================================================
 
-* Using JSX (React), Vue or TypeScript with AssetMapper is possible, but you'll
-   need to use their native tools for pre-compilation. Also, some features (like
-   Vue single-file components) cannot be compiled down to pure JavaScript that can
-   be executed by a browser.
+.. [#1] Using JSX (React), Vue or TypeScript with AssetMapper is possible, but you'll
+        need to use their native tools for pre-compilation. Also, some features (like
+        Vue single-file components) cannot be compiled down to pure JavaScript that can
+        be executed by a browser.
 
 .. _frontend-webpack-encore: