Remove the mentions of `local` volume

Signed-off-by: Sheng Yang <sheng.yang@rancher.com>

README.md

@@ -3,12 +3,12 @@
 
 ## Overview
 
-Local Path Provisioner provides a way for the Kubernetes users to utilize the local storage in each node. Based on the user configuration, the Local Path Provisioner will create `local` based persistent volume on the node automatically. It utilizes the features introduced by Kubernetes [Local Persistent Volume feature](https://kubernetes.io/blog/2018/04/13/local-persistent-volumes-beta/), but make it a simpler solution than the built-in `local` volume feature in Kubernetes.
+Local Path Provisioner provides a way for the Kubernetes users to utilize the local storage in each node. Based on the user configuration, the Local Path Provisioner will create `hostPath` based persistent volume on the node automatically. It utilizes the features introduced by Kubernetes [Local Persistent Volume feature](https://kubernetes.io/blog/2018/04/13/local-persistent-volumes-beta/), but make it a simpler solution than the built-in `local` volume feature in Kubernetes.
 
 ## Compare to built-in Local Persistent Volume feature in Kubernetes
 
 ### Pros
-Dynamic provisioning the volume using [local volume](https://kubernetes.io/docs/concepts/storage/volumes/#local).
+Dynamic provisioning the volume using hostPath.
 * Currently the Kubernetes [Local Volume provisioner](https://github.com/kubernetes-sigs/sig-storage-local-static-provisioner) cannot do dynamic provisioning for the local volumes.
 
 ### Cons
@@ -42,7 +42,7 @@ $ kubectl -n local-path-storage logs -f -l app=local-path-provisioner
 
 ## Usage
 
-Create a `local` backend Persistent Volume and a pod uses it:
+Create a `hostPath` backend Persistent Volume and a pod uses it:
 
 ```
 kubectl create -f https://raw.githubusercontent.com/rancher/local-path-provisioner/master/examples/pvc.yaml