MAGETWO-47544: "Learn More" link for Payments Pro goes to Payflow Pro

 - Added "Learn More" url to module system config

Author: YevSent

app/code/Magento/Paypal/etc/adminhtml/system.xml

@@ -50,6 +50,7 @@
                 <include path="Magento_Paypal::system/payflow_advanced.xml"/>
                 <group id="wpp_usuk" sortOrder="40" extends="payment_us/paypal_payment_gateways/paypal_payflowpro_with_express_checkout">
                     <label>Payments Pro (Includes Express Checkout)</label>
+                    <more_url>https://www.paypal.com/us/webapps/mpp/paypal-payments-pro?partner_id=NB9WWHYEMVUMS</more_url>
                     <attribute type="activity_path">payment/paypal_payment_pro/active</attribute>
                     <group id="paypal_payflow_required" translate="label" showInDefault="1" showInWebsite="1" sortOrder="10">
                         <field id="enable_paypal_payflow">