Fix developer testing instruction for 10773 PR

- remove instructions to force migrate the templates.

Author: Tarun Vijwani

docs/internal-developers/testing/releases/1120.md

@@ -127,16 +127,7 @@ Before testing, take note of the frontend appearance of the cart/checkout pages.
 
 1. Create a fresh instance of JN with previous version of Woocommerce blocks and save some customisations to your cart/checkout page tenplates.
 2. Install and activate the zip file for this release.
-3. Go to the site editor templates section. You'll see "checkout" (your custom template) and "Page: Checkout" (the new template).
-4. You need to force a migration. You can manually call in Bootstrap.php the following:
-
-```php
-$this->migration->wc_blocks_update_1120_rename_checkout_template();
-$this->migration->wc_blocks_update_1120_rename_cart_template();
-```
-
-5. When you load a page it will run the above and migrate the templates. Remove the above code then go back to the site editor.
-6. You should now see only one "Page: Checkout" template, and it should contain the customisations you previously made to checkout.
+3. You should now see only one "Page: Checkout" template, and it should contain the customisations you previously made to checkout.
 
 ### Fix: Password Protection not respected on single product template [#10999](https://github.com/woocommerce/woocommerce-blocks/pull/10999)