docs: change 1.2.1 to 1.3.0 (#1077)

* 1.3.0 released yesterday

* change other install docs as well

Co-authored-by: Akshay Gupta <aksgupta@microsoft.com>

docs/setup/install-existing.md

@@ -162,7 +162,7 @@ You can use [Cloud Shell](https://shell.azure.com/) to install the AGIC Helm pac
     helm install ingress-azure \
       -f helm-config.yaml \
       application-gateway-kubernetes-ingress/ingress-azure \
-      --version 1.2.1
+      --version 1.3.0
     ```
 
     >Note: Use at least version 1.2.0-rc3, e.g. `--version 1.2.0-rc3`, when installing on k8s version >= 1.16
@@ -182,7 +182,7 @@ You can use [Cloud Shell](https://shell.azure.com/) to install the AGIC Helm pac
          --set rbac.enabled=true \
          --set verbosityLevel=3 \
          --set kubernetes.watchNamespace=default \
-         --version 1.2.1
+         --version 1.3.0
     ```
 
     >Note: Use at least version 1.2.0-rc3, e.g. `--version 1.2.0-rc3`, when installing on k8s version >= 1.16

docs/setup/install-new-windows-cluster.md

@@ -287,7 +287,7 @@ Values:
       -f helm-config.yaml \
       application-gateway-kubernetes-ingress/ingress-azure \
       --set nodeSelector."beta\.kubernetes\.io/os"=linux \
-      --version 1.2.1
+      --version 1.3.0
     ```
 
     >Note: Use at least version 1.2.0-rc3, e.g. `--version 1.2.0-rc3`, when installing on k8s version >= 1.16

docs/setup/install-new.md

@@ -231,7 +231,7 @@ Values:
     helm install ingress-azure \
       -f helm-config.yaml \
       application-gateway-kubernetes-ingress/ingress-azure \
-      --version 1.2.1
+      --version 1.3.0
     ```
 
     >Note: Use at least version 1.2.0-rc1, i.e. `--version 1.2.0-rc1`, when installing on k8s version >= 1.16