Fix linting errors in WC Blocks 7.8.1 testing instructions (#6564)

Author: Aljullu

docs/testing/releases/781.md

@@ -1,10 +1,10 @@
-## Testing notes and ZIP for release 7.8.1
+# Testing notes and ZIP for release 7.8.1
 
 Zip file for testing: [woocommerce-gutenberg-products-block.zip](https://github.com/woocommerce/woocommerce-blocks/files/8891266/woocommerce-gutenberg-products-block.zip)
 
 ## Feature plugin and package inclusion in WooCommerce
 
-###  Fix PHP notice in Mini Cart when prices included taxes. ([6537](https://github.com/woocommerce/woocommerce-blocks/pull/6537))
+### Fix PHP notice in Mini Cart when prices included taxes. ([6537](https://github.com/woocommerce/woocommerce-blocks/pull/6537))
 
 1. Go to _WooCommerce_ > _Settings_ and check _Enable tax rates and calculations_.
 2. Go to the _Tax_ tab in the settings and check _Yes, I will enter prices inclusive of tax_ and _Display prices during cart and checkout: Including tax_.
@@ -13,4 +13,4 @@ Zip file for testing: [woocommerce-gutenberg-products-block.zip](https://github.
 
 | Before                                                                                                                                    | After                                                                                                                                      |
 |-------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------|
-| ![Screenshot showing a PHP warning](https://user-images.githubusercontent.com/3616980/172639823-1b671ac0-58ea-4f4b-9b00-aa481d4acd72.png) | ![Screenshot showing no PHP warning](https://user-images.githubusercontent.com/3616980/172639911-7a1416fe-f49d-4c58-90b7-7e07637b1777.png) |
+| ![Screenshot showing a PHP warning](https://user-images.githubusercontent.com/3616980/172639823-1b671ac0-58ea-4f4b-9b00-aa481d4acd72.png) | ![Screenshot showing no PHP warning](https://user-images.githubusercontent.com/3616980/172639911-7a1416fe-f49d-4c58-90b7-7e07637b1777.png) |