Update index.html

index.html

@@ -739,7 +739,7 @@ <h2>
               <li>For each |paymentMethod| of |methodData|:
                 <ol>
                   <li data-tests=
-                  "payment-request-ctor-pmi-handling.https.html">Run the steps
+                  "payment-request-ctor-pmi-handling.https.sub.html">Run the steps
                   to <a>validate a payment method identifier</a> with
                   |paymentMethod|.{{PaymentMethodData/supportedMethods}}. If it
                   returns false, then throw a {{RangeError}} exception.