Docs: add removed message for cloud_provider

Signed-off-by: ChengHao Yang <17496418+tico88612@users.noreply.github.com>

docs/_sidebar.md

@@ -15,7 +15,7 @@
   * [Ansible](/docs/ansible/ansible.md)
   * [Ansible Collection](/docs/ansible/ansible_collection.md)
   * [Vars](/docs/ansible/vars.md)
-* Cloud Providers
+* Cloud Providers (deprecated)
   * [Aws](/docs/cloud_providers/aws.md)
   * [Azure](/docs/cloud_providers/azure.md)
   * [Cloud](/docs/cloud_providers/cloud.md)

docs/advanced/gcp-lb.md

 # GCP Load Balancers for type=LoadBalacer of Kubernetes Services
 
+> **Removed**: Since v1.31 (the Kubespray counterpart is v2.27), Kubernetes no longer supports `cloud_provider`. (except external cloud provider)
+
 Google Cloud Platform can be used for creation of Kubernetes Service Load Balancer.
 
 This feature is able to deliver by adding parameters to `kube-controller-manager` and `kubelet`. You need specify:

docs/cloud_providers/aws.md

 # AWS
 
+> **Removed**: Since v1.31 (the Kubespray counterpart is v2.27), Kubernetes no longer supports `cloud_provider`. (except external cloud provider)
+
 To deploy kubespray on [AWS](https://aws.amazon.com/) uncomment the `cloud_provider` option in `group_vars/all.yml` and set it to `'aws'`. Refer to the [Kubespray Configuration](#kubespray-configuration) for customizing the provider.
 
 Prior to creating your instances, you **must** ensure that you have created IAM roles and policies for both "kubernetes-master" and "kubernetes-node". You can find the IAM policies [here](https://github.com/kubernetes-sigs/kubespray/tree/master/contrib/aws_iam/). See the [IAM Documentation](https://aws.amazon.com/documentation/iam/) if guidance is needed on how to set these up. When you bring your instances online, associate them with the respective IAM role. Nodes that are only to be used for Etcd do not need a role.

docs/cloud_providers/azure.md

 # Azure
 
+> **Removed**: Since v1.31 (the Kubespray counterpart is v2.27), Kubernetes no longer supports `cloud_provider`. (except external cloud provider)
+
 To deploy Kubernetes on [Azure](https://azure.microsoft.com) uncomment the `cloud_provider` option in `group_vars/all/all.yml` and set it to `'azure'`.
 
 All your instances are required to run in a resource group and a routing table has to be attached to the subnet your instances are in.

docs/cloud_providers/cloud.md

 # Cloud providers
 
+> **Removed**: Since v1.31 (the Kubespray counterpart is v2.27), Kubernetes no longer supports `cloud_provider`. (except external cloud provider)
+
 ## Provisioning
 
 You can deploy instances in your cloud environment in several ways. Examples include Terraform, Ansible (ec2 and gce modules), and manual creation.