site: fix eventing links (#859)

* fix eventing links

* Update README.md

docs/eventing/samples/github-source/README.md

@@ -15,7 +15,7 @@ You will need:
 1. Ensure Knative Serving is [configured with a domain
    name](https://github.com/knative/docs/blob/master/serving/using-a-custom-domain.md)
    that allows GitHub to call into the cluster.
-1. If you're using GKE, you'll also want to [assign a static IP address](https://github.com/knative/docs/blob/master/serving/gke-assigning-static-ip-address.md).
+1. If you're using GKE, you'll also want to [assign a static IP address](../../../serving/gke-assigning-static-ip-address.).
 1. Install [Knative
    Eventing](https://github.com/knative/docs/tree/master/eventing). Those
    instructions also install the default eventing sources, including

docs/eventing/samples/writing-a-source/01-bootstrap.md

@@ -53,4 +53,4 @@ your project's vendor directory.
 The result of this command in the reference project can be viewed at
 https://github.com/grantr/sample-source/pull/1.
 
-Next: [Define The Source Resource](02-define-source.md)
+Next: [Define The Source Resource](02-define-source/)

docs/eventing/samples/writing-a-source/02-define-source.md

@@ -202,4 +202,4 @@ make
 These edits in the reference project can be viewed at
 https://github.com/grantr/sample-source/pull/4.
 
-Next: [Reconcile Sources](03-reconcile-sources.md)
+Next: [Reconcile Sources](03-reconcile-sources/)

docs/eventing/samples/writing-a-source/03-reconcile-sources.md

@@ -218,4 +218,4 @@ g.Eventually(func() error {
 These edits in the reference project can be viewed at
 https://github.com/grantr/sample-source/pull/9.
 
-Next: [Publish to Cluster](04-publish-to-cluster.md)
+Next: [Publish to Cluster](04-publish-to-cluster/)