update link

contrib/network-storage/heketi/README.md

@@ -1,5 +1,5 @@
 # Deploy Heketi/Glusterfs into Kubespray/Kubernetes
-This playbook aims to automate (this)[https://github.com/heketi/heketi/blob/master/docs/admin/install-kubernetes.md] tutorial. It deploys heketi/glusterfs into kubernetes and sets up a storageclass.
+This playbook aims to automate [this](https://github.com/heketi/heketi/blob/master/docs/admin/install-kubernetes.md) tutorial. It deploys heketi/glusterfs into kubernetes and sets up a storageclass.
 
 ## Install
 Copy the inventory.yml.sample over to inventory/sample/k8s_heketi_inventory.yml and change it according to your setup.