docs(routing): Note on middleware returns

Better describe middleware and how returning within it behaves

docs/content/1.guide/3.routing.md

@@ -172,6 +172,7 @@ nitro.config.ts
 ### Simple Middleware
 
 Middleware are defined exactly like route handlers with the only exception that they should not return anything.
+Returning from middleware behaves like returning from a request - the value will be returned as a response and further code will not be ran.
 
 ```ts [middleware/auth.ts]
 export default defineEventHandler((event) => {
@@ -181,7 +182,7 @@ export default defineEventHandler((event) => {
 ```
 
 ::alert
-Returning anything from a middleware will close the request and should be avoided!
+Returning anything from a middleware will close the request and should be avoided! Any returned value from middleware will be the response and further code will not be executed.
 ::
 
 ### Execution Order