docs(tasks): update dev server usage

docs/1.guide/10.tasks.md

@@ -133,24 +133,65 @@ This endpoint returns a list of available task names and their meta.
       "description": "Update CMS content"
     }
   },
-  "scheduledTasks": {
-    "* * * * *": [
-      "cms:update"
-    ]
-  }
+  "scheduledTasks": [
+    {
+      "cron": "* * * * *",
+      "tasks": [
+        "cms:update"
+      ]
+    }
+  ]
 }
 ```
 
 #### `/_nitro/tasks/:name`
 
-This endpoint executes a task. You can provide a payload using both query parameters and body JSON payload.
+This endpoint executes a task. You can provide a payload using both query parameters and body JSON payload. The payload sent in the JSON body payload must be under the `"payload"` property.
 
-```json
-// [GET] /_nitro/tasks/db:migrate
+::code-group
+```ts [tasks/echo/payload.ts]
+export default defineTask({
+  meta: {
+    name: "echo:payload",
+    description: "Returns the provided payload",
+  },
+  run({ payload, context }) {
+    console.log("Running echo task...");
+    return payload;
+  },
+});
+```
+```json [GET]
+// [GET] /_nitro/tasks/echo:payload?field=value&array=1&array=2
 {
-  "result": "Database migrations completed!"
+  "field": "value",
+  "array": ["1", "2"]
 }
 ```
+```json [POST]
+/**
+ * [POST] /_nitro/tasks/echo:payload?field=value
+ * body: {
+ *   "payload": {
+ *     "answer": 42,
+ *     "nested": {
+ *       "value": true
+ *     }
+ *   }
+ * }
+ */
+{
+  "field": "value",
+  "answer": 42,
+  "nested": {
+    "value": true
+  }
+}
+```
+::
+
+> [!NOTE]
+> The JSON payload included in the body will overwrite the keys present in the query params.
 
 ### Using CLI