Update change-billing.md

Updated steps to update card information from the billing page.

website/docs/faqs/Accounts/change-billing.md

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-If you want to change your account's credit card details, select the gear menu in the upper right corner of dbt Cloud. Go to Account Settings  → Billing  → Payment Information. In the upper right corner of Payment Information, click **Edit** to enter the new credit card details. Only the _account owner_ can make this change. 
+If you want to change your account's credit card details, select the gear menu in the upper right corner of dbt Cloud. Go to Account Settings  → Billing  → Payment Information. Enter the new credit card details on the respective fields then click on **Update payment information**. Only the _account owner_ can make this change. 
 
 To change your billing name or location address, send our Support team a message at [email protected] with the newly updated information, and we can make that change for you!