docs: provide option for installing using a specific version via Helm (#12968)

* docs: provide option for installing using a specific version via Helm

Co-authored-by: Tu Nguyen <im2nguyen@users.noreply.github.com>
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@ -156,17 +156,20 @@ The Consul Helm only supports Helm 3.2+. Install the latest version of the Helm
kube-system Active 18h
```
1. Issue the following command to install Consul with the default configuration using Helm. You could also install Consul on a dedicated
namespace of your choosing by modifying the value of the `-n` flag for the Helm install.
1. Install Consul on Kubernetes using Helm. The Helm chart does everything to set up a recommended Consul-on-Kubernetes deployment. After installation, a Consul cluster will be formed, a leader will be elected, and every node will have a running Consul agent.
1. To install the latest version of Consul on Kubernetes, issue the following command to install Consul with the default configuration using Helm. You could also install Consul on a dedicated namespace of your choosing by modifying the value of the `-n` flag for the Helm install.
```shell-session
$ helm install consul hashicorp/consul --set global.name=consul --create-namespace --namespace consul
NAME: consul
...
```
The Helm chart does everything to set up a recommended Consul-on-Kubernetes deployment.
After installation, a Consul cluster will be formed, a leader will be elected, and every node will have a running Consul agent.
```shell-session
$ helm install consul hashicorp/consul --set global.name=consul --create-namespace --namespace consul
```
1. To install a specific version of Consul on Kubernetes, issue the following command with `--version` flag to install the specified version with the default configuration using Helm.
```shell-session
$ export VERSION=0.43.0
$ helm install consul hashicorp/consul --set global.name=consul --version ${VERSION} --create-namespace --namespace consul
```
### Customizing Your Installation