Update in ssh key doc to highlight the fact that those keys are currently not useable with Openstack resources

Author: yomovh

website/docs/r/me_ssh_key.html.markdown

@@ -6,6 +6,8 @@ subcategory : "Account Management"
 
 Creates an SSH Key.
 
+-> __NOTE__ An SSH key in OVH provider cannot be currently used with Public Cloud instances through terraform. We advise  to use [openstack provider](https://registry.terraform.io/providers/terraform-provider-openstack/openstack/latest) to manage Public Cloud instances. Hence, if you need to associate an SSH key to a Public Cloud instance, you need to use [openstack_compute_keypair_v2](https://registry.terraform.io/providers/terraform-provider-openstack/openstack/latest/docs/resources/compute_keypair_v2)
+
 ## Example Usage
 
 ```hcl