update service resource spec url (#2031)

Author: MIBc

docs/serving/README.md

@@ -15,22 +15,22 @@ Knative Serving defines a set of objects as Kubernetes Custom Resource
 Definitions (CRDs). These objects are used to define and control how your
 serverless workload behaves on the cluster:
 
-- [Service](https://github.com/knative/serving/blob/master/docs/spec/spec.md#service):
+- [Service](https://github.com/knative/docs/blob/master/docs/serving/spec/knative-api-specification-1.0.md#service):
   The `service.serving.knative.dev` resource automatically manages the whole
   lifecycle of your workload. It controls the creation of other objects to
   ensure that your app has a route, a configuration, and a new revision for each
   update of the service. Service can be defined to always route traffic to the
   latest revision or to a pinned revision.
-- [Route](https://github.com/knative/serving/blob/master/docs/spec/spec.md#route):
+- [Route](https://github.com/knative/docs/blob/master/docs/serving/spec/knative-api-specification-1.0.md#route):
   The `route.serving.knative.dev` resource maps a network endpoint to one or
   more revisions. You can manage the traffic in several ways, including
   fractional traffic and named routes.
-- [Configuration](https://github.com/knative/serving/blob/master/docs/spec/spec.md#configuration):
+- [Configuration](https://github.com/knative/docs/blob/master/docs/serving/spec/knative-api-specification-1.0.md#configuration):
   The `configuration.serving.knative.dev` resource maintains the desired state
   for your deployment. It provides a clean separation between code and
   configuration and follows the Twelve-Factor App methodology. Modifying a
   configuration creates a new revision.
-- [Revision](https://github.com/knative/serving/blob/master/docs/spec/spec.md#revision):
+- [Revision](https://github.com/knative/docs/blob/master/docs/serving/spec/knative-api-specification-1.0.md#revision):
   The `revision.serving.knative.dev` resource is a point-in-time snapshot of the
   code and configuration for each modification made to the workload. Revisions
   are immutable objects and can be retained for as long as useful. Knative