fix some version in docs

docs/install.md

@@ -33,7 +33,7 @@ Kube-OVN provides a one script install to easily install a high-available, produ
  JOIN_CIDR="100.64.0.0/16"              # Do NOT overlap with NODE/POD/SVC CIDR
  LABEL="node-role.kubernetes.io/master" # The node label to deploy OVN DB
  IFACE=""                               # The nic to support container network, if empty will use the nic that the default route use
- VERSION="v1.1.0"
+ VERSION="v1.2.1"
 ```
 
 3. Execute the script
@@ -51,19 +51,19 @@ For Kubernetes version before 1.17 please use the following command to add the n
     `kubectl label node <Node on which to deploy OVN DB> kube-ovn/role=master`
 2. Install Kube-OVN related CRDs
 
-    `kubectl apply -f https://raw.githubusercontent.com/alauda/kube-ovn/release/1.1/yamls/crd.yaml`
+    `kubectl apply -f https://raw.githubusercontent.com/alauda/kube-ovn/release-1.2/yamls/crd.yaml`
 3. Install native OVS and OVN components:
 
-    `kubectl apply -f https://raw.githubusercontent.com/alauda/kube-ovn/release/1.1/yamls/ovn.yaml`
+    `kubectl apply -f https://raw.githubusercontent.com/alauda/kube-ovn/release-1.2/yamls/ovn.yaml`
 4. Install the Kube-OVN Controller and CNI plugins:
 
-    `kubectl apply -f https://raw.githubusercontent.com/alauda/kube-ovn/release/1.1/yamls/kube-ovn.yaml`
+    `kubectl apply -f https://raw.githubusercontent.com/alauda/kube-ovn/release-1.2/yamls/kube-ovn.yaml`
 
 That's all! You can now create some pods and test connectivity.
 
 For high-available ovn db, see [high available](high-available.md)
 
-If you want to enable IPv6 on default subnet and node subnet, please apply https://raw.githubusercontent.com/alauda/kube-ovn/release/1.1/yamls/kube-ovn-ipv6.yaml on Step 3.
+If you want to enable IPv6 on default subnet and node subnet, please apply https://raw.githubusercontent.com/alauda/kube-ovn/release-1.2/yamls/kube-ovn-ipv6.yaml on Step 3.
 
 ## More Configuration