docs: update README.md
Fixes:
@@ -70,7 +70,7 @@ make backwards-incompatible changes.
| [Translate][cloud-translate] | stable | [`cloud.google.com/go/translate`](https://pkg.go.dev/cloud.google.com/go/translate) |
| [Video Intelligence][cloud-video] | beta | [`cloud.google.com/go/videointelligence/apiv1beta2`](https://pkg.go.dev/cloud.google.com/go/videointelligence/apiv1beta2) |
| [Vision][cloud-vision] | stable | [`cloud.google.com/go/vision/apiv1`](https://pkg.go.dev/cloud.google.com/go/vision/apiv1) |
-| [Webrisk][cloud-webrisk] | alpha | [`cloud.google.com/go/webrisk/apiv1beta1`](https://pkg.go.dev/cloud.google.com/go/webrisk/apiv1beta1) |
+| [Webrisk][cloud-webrisk] | alpha | [`cloud.google.com/go/webrisk/apiv1`](https://pkg.go.dev/cloud.google.com/go/webrisk/apiv1) |
> **Alpha status**: the API is still being actively developed. As a
> result, it might change in backward-incompatible ways and is not recommended
