Merge pull request #10203 from w3c/fixup_show_test

fix: assert_equals check is wrong
diff --git a/payment-request/show-method-optional-promise-resolves-manual.https.html b/payment-request/show-method-optional-promise-resolves-manual.https.html
index 777910c..623db15 100644
--- a/payment-request/show-method-optional-promise-resolves-manual.https.html
+++ b/payment-request/show-method-optional-promise-resolves-manual.https.html
@@ -181,7 +181,7 @@
     const request = new PaymentRequest(validMethods, failDetails, options);
     const detailsPromise = Promise.resolve(details);
     const acceptPromise = request.show(detailsPromise);
-    assert_equals(request.id, "this cant be changed", "id must never change.");
+    assert_equals(request.id, "this cannot be changed", "id must never change.");
     await promise_rejects(
       t,
       "AbortError",