Updating the interface data source documentation

Signed-off-by: Arun Tony <[email protected]>

Author: aruntony005

docs/data-sources/policy_tier0_gateway_interface.md renamed to docs/data-sources/policy_gateway_interface.md

@@ -39,7 +39,7 @@ data "nsxt_policy_gateway_interface" "tier1_gw_interface" {
 ## Argument Reference
 
 * `display_name` - (Required) The Display Name prefix of the gateway interface to retrieve.
-* `gateway_path` - (Required) The path of the gateway to retrieve which the interface should be linked to.
+* `gateway_path` - (Required) The path of the gateway to retrieve, where the interface should be linked to.
 
 ## Attributes Reference