docs: Add missing brackets to example

docs/guide/essentials/assets.md

@@ -115,7 +115,7 @@ export default defineConfig({
     web_accessible_resources: [
       {
         // We'll use this matches in the cotent script as well
-        matches: '*://*.github.com/*',
+        matches: ['*://*.github.com/*'],
         // Use the same path as `relativeDest` from the WXT module
         resources: ['/oxc_parser_wasm_bg.wasm'],
       },