fix some typos in testing checklist

plugins/woocommerce-blocks/docs/testing/cart-checkout/editor.md

@@ -2,7 +2,7 @@
 
 # Editor experience
 
-- [ ] You should be able to add, and only one Cart or Checkout block to a page.
+- [ ] You should be able to add one and only one Cart or Checkout block to a page.
 - [ ] The preview in the inserter should show a skeleton of how the block structure should look like.
 - [ ] When inserting any of the blocks, it should have some data already in it.
 - [ ] You should not be able to interact directly with the block (except for some sections).

plugins/woocommerce-blocks/docs/testing/cart-checkout/general-flow.md

@@ -12,6 +12,7 @@ taxes (if you have any), shipping and so on.
 
 - [ ] Create pages with Cart and Checkout blocks.
 - [ ] Set the continue to checkout link your Cart settings to the Checkout page you created.
+- [ ] In Woocommerce -> Settings -> Advanced, set the new pages to your default Cart and Checkout.
 - [ ] Add some products to your cart.
 - [ ] Mix in a limited stock product or a coupon.
 - [ ] Continue to checkout.

plugins/woocommerce-blocks/docs/testing/cart-checkout/payment.md

@@ -21,7 +21,7 @@ To test Express payment methods there are some special requirements like
 - To test Microsoft Pay you will need to have Edge installed.
 - You will also need to be on a supported country, to better verify your compatibility visit
   [this page](https://stripe.com/docs/stripe-js/elements/payment-request-button#react-overview)
-  You should see if you're on a supported platform or not
+  You should see if you're on a supported platform or not.
 
 Unsupported:
 ![](https://i.imgur.com/EpkFrat.png).