Fix docs for azurerm_virtual_machine and ssh_keys (#6171)

For `ssh_keys` in `os_profile_linux_config`, the docs specify `key_path`, but the code expects `path` - 453d38bafc/builtin/providers/azurerm/resource_arm_virtual_machine.go (L284).

website/source/docs/providers/azurerm/r/virtual_machine.html.markdown

@@ -175,7 +175,7 @@ For more information on the different example configurations, please check out t
 `os_profile_linux_config` supports the following:
 
 * `disable_password_authentication` - (Required) Specifies whether password authentication should be disabled.
-* `ssh_keys` - (Optional) Specifies a collection of `key_path` and `key_data` to be placed on the virtual machine.
+* `ssh_keys` - (Optional) Specifies a collection of `path` and `key_data` to be placed on the virtual machine.
 
 `os_profile_secrets` supports the following:
 
@@ -191,4 +191,4 @@ For more information on the different example configurations, please check out t
 
 The following attributes are exported:
 
-* `id` - The virtual machine ID.
+* `id` - The virtual machine ID.