resolve grammar issue

guides/v2.1/payments-integrations/vault/vault-intro.md

@@ -27,7 +27,8 @@ The main difference is that when vault is used, it defines what command is requi
 ## Adding vault: general steps
 
 Magento vault implementation provides that vault is available as a separate payment method during order creation (storefront or admin). But technically it is tightly related to the corresponding payment provider integration.   
-You do not need to create a new {% glossarytooltip c1e4242b-1f1a-44c3-9d72-1d5b1435e142 %}module{% endglossarytooltip %} for vault implementation. All required configuration and entities are added in the module of the payment provider integration.
+You do not need to create a new {% glossarytooltip c1e4242b-1f1a-44c3-9d72-1d5b1435e142 %}module{% endglossarytooltip %} for vault implementation. All required configuration and entities are added to the module of the payment provider integration. 
+
 
 The topics of this chapter describe how to add the vault functionality to a payment method (the payment method must be implemented using Magento payment gateway):
 
@@ -38,4 +39,4 @@ The topics of this chapter describe how to add the vault functionality to a paym
 5. [Storing and processing the payment related data]({{page.baseurl}}payments-integrations/vault/payment-token.html).
 6. [Adding and using  UI_Vault component to place orders on the storefront]({{page.baseurl}}payments-integrations/vault/token-ui-component-provider.html).
 7. [Display stored tokens for customer and process their deleting]({{page.baseurl}}payments-integrations/vault/customer-stored-payments.html).
-8. [Using stored tokens to place order from Admin panel]({{page.baseurl}}payments-integrations/vault/admin-integration.html).
+8. [Using stored tokens to place an order from Admin panel]({{page.baseurl}}payments-integrations/vault/admin-integration.html).