docs/packet: Fix formatting

Signed-off-by: knrt10 <kautilya@kinvolk.io>

Author: knrt10

docs/configuration-reference/platforms/packet.md

@@ -193,7 +193,7 @@ node_type = var.custom_default_worker_type
 ## Attribute reference
 
 | Argument                              | Description                                                                                                                                                                                                                                                                                                                        | Default         | Type         | Required |
-|---------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-:-:-------------|-:-:----------|-:-:------|
+|---------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|--------------|----------|
 | `auth_token`                          | Packet Project API token. Can be supplied using `PACKET_AUTH_TOKEN` environment variable.                                                                                                                                                                                                                                          | -               | string       | false    |
 | `asset_dir`                           | Location where Lokomotive stores cluster assets.                                                                                                                                                                                                                                                                                   | -               | string       | true     |
 | `cluster_name`                        | Name of the cluster.                                                                                                                                                                                                                                                                                                               | -               | string       | true     |