community: fix discussion group links

Signed-off-by: Pires <[email protected]>

CONTRIBUTING.md

@@ -57,7 +57,7 @@ Learn how to engage with the Kubernetes community on the [community page](http:/
 You can reach the maintainers of this project at:
 
 - [Slack](http://slack.k8s.io/)
-- [Mailing List](https://groups.google.com/forum/#!forum/kubernetes-kubebuilder)
+- [Mailing List](https://groups.google.com/forum/#!forum/kubebuilder)
 
 ## Becoming a reviewer or approver
 

RELEASE.md

@@ -6,7 +6,7 @@ The Kubebuilder Project is released on an as-needed basis. The process is as fol
 1. All [OWNERS](OWNERS) must LGTM this release
 1. An OWNER runs `git tag -s $VERSION` and inserts the changelog and pushes the tag with `git push $VERSION`
 1. The release issue is closed
-1. An announcement email is sent to `kubernetes-[email protected]` with the subject `[ANNOUNCE] kubebuilder $VERSION is released`
+1. An announcement email is sent to `[email protected]` with the subject `[ANNOUNCE] kubebuilder $VERSION is released`
 
 Note: This process does not apply to EAP or alpha (pre-)releases which may be cut at any time for development
 and testing.
@@ -16,4 +16,4 @@ and testing.
 The binaries releases for HEAD are available here:
 
 - [kubebuilder-release-master-head-darwin-amd64.tar.gz](https://storage.googleapis.com/kubebuilder-release/kubebuilder-release-master-head-darwin-amd64.tar.gz)
-- [kubebuilder-release-master-head-linux-amd64.tar.gz](https://storage.googleapis.com/kubebuilder-release/kubebuilder-release-master-head-linux-amd64.tar.gz)
+- [kubebuilder-release-master-head-linux-amd64.tar.gz](https://storage.googleapis.com/kubebuilder-release/kubebuilder-release-master-head-linux-amd64.tar.gz)