Add intro paragraph for bring your own backend

Author: craigshoemaker

articles/static-web-apps/deploy-nextjs-hybrid.md

@@ -126,7 +126,7 @@ A managed backed is automatically available for every hybrid Next.js deployment
 
 ### Bring your own backend
 
-
+You can improve performance and gain more control over the Next.js server side rendering when you bring your backend. Use the following steps to set up a custom backend for your site. 
 
 [!INCLUDE [Server side rendering](../../includes/static-web-apps/static-web-apps-nextjs-backends.md)]