docs: fix `addDevServerHandler` API (#25233)

docs/3.api/5.kit/11.nitro.md

@@ -105,14 +105,11 @@ Adds a nitro server handler to be used only in development mode. This handler wi
 ### Type
 
 ```ts
-function addDevServerHandler (handler: NitroEventHandler): void
+function addDevServerHandler (handler: NitroDevEventHandler): void
 
-export interface NitroEventHandler {
+export interface NitroDevEventHandler {
-  handler: string;
+  handler: EventHandler;
   route?: string;
-  middleware?: boolean;
-  lazy?: boolean;
-  method?: string;
 }
 ```
 
@@ -130,7 +127,7 @@ A handler object with the following properties:
 
   **Type**: `string`
 
-  Path to event handler.
+  The event handler.
 
 - `route` (optional)
 
@@ -138,24 +135,6 @@ A handler object with the following properties:
 
   Path prefix or route. If an empty string used, will be used as a middleware.
 
-- `middleware` (optional)
-
-  **Type**: `boolean`
-
-  Specifies this is a middleware handler. Middleware are called on every route and should normally return nothing to pass to the next handlers.
-
-- `lazy` (optional)
-
-  **Type**: `boolean`
-
-  Use lazy loading to import handler.
-
-- `method` (optional)
-
-  **Type**: `string`
-
-  Router method matcher.
-
 ### Examples
 
 ::code-group
@@ -168,21 +147,17 @@ export default defineNuxtModule({
     const resolver = createResolver(import.meta.url)
 
     addDevServerHandler({
-      handler: resolver.resolve('./runtime/uptime.get'),
+      handler: () => {
+        return {
+          body: `Response generated at ${new Date().toISOString()}`
+        }
+      },
       route: '/_handler'
     })
   }
 })
 ```
 
-```ts [runtime/timer.get.ts]
-export default defineEventHandler(() => {
-  return {
-    body: `Response generated at ${new Date().toISOString()}`
-  }
-})
-```
-
 ::
 
 ```ts