Corrected vsphere directory (kubernetes-sigs#9534)

There is a wrong directory path to all.yml and vsphere.yml. The wrong directory is `inventory/sample/group_vars/all.yml` and `inventory/sample/group_vars/all/vsphere.yml` which should be `inventory/sample/group_vars/all/all.yml` and `inventory/sample/group_vars/all/vsphere.yml`.

docs/vsphere.md

@@ -21,14 +21,14 @@ After this step you should have:
 
 ### Kubespray configuration
 
-First in `inventory/sample/group_vars/all.yml` you must set the cloud provider to `external` and external_cloud_provider to `external_cloud_provider`.
+First in `inventory/sample/group_vars/all/all.yml` you must set the cloud provider to `external` and external_cloud_provider to `external_cloud_provider`.
 
 ```yml
 cloud_provider:  "external"
 external_cloud_provider: "vsphere"
 ```
 
-Then, `inventory/sample/group_vars/vsphere.yml`, you need to declare your vCenter credentials and enable the vSphere CSI following the description below.
+Then, `inventory/sample/group_vars/all/vsphere.yml`, you need to declare your vCenter credentials and enable the vSphere CSI following the description below.
 
 | Variable                               | Required | Type    | Choices                    | Default                   | Comment                                                                                                             |
 |----------------------------------------|----------|---------|----------------------------|---------------------------|---------------------------------------------------------------------------------------------------------------------|