Update src/routes/solid-start/guides/security.mdx

Co-authored-by: Sarah <gerrardsarah@gmail.com>

Author: amirhhashemi

src/routes/solid-start/guides/security.mdx

@@ -76,7 +76,7 @@ export default createHandler(
 
 ### Without nonce
 
-To configure CSP without a nonce, create a middleware that configures the CSP header, then register it to run on the [`onBeforeResponse`](/solid-start/advanced/middleware#onbeforeresponse) event:
+To configure CSP without a nonce, a middleware that sets the CSP header is required, and it should be registered to run during the [`onBeforeResponse`](/solid-start/advanced/middleware#onbeforeresponse) event:
 
 ```tsx
 import { createMiddleware } from "@solidjs/start/middleware";