docs: remove unnecessary brackets in sample (#11168)

In the Migration guide, there are in the sample some obsolete brackets which I removed, so when the developer is copying the sample he doesn't copy those brackets anymore

<img width="649" alt="image" src="https://github.com/user-attachments/assets/91478ef0-1b72-41a1-b9cb-50c9d9c656e6" />

Author: EdrilanBerisha

docs/6-migration-guides/01-to-version-2.md

@@ -2315,13 +2315,11 @@ toast.addEventListener("close", (event) => {
 If you previously used the `show()` method:
 ```ts
 toast.show();
-});
 ```
 Now, you must use the `open` property:
 
 ```ts
-toast.open=true
-});
+toast.open=true;
 ```