Update core_service_gateway.html.markdown

Author: mbfrahry

website/docs/r/core_service_gateway.html.markdown

@@ -43,7 +43,7 @@ resource "oci_core_service_gateway" "test_service_gateway" {
 
 The following arguments are supported:
 
-* `compartment_id` - (Required) The [OCID] (/Content/General/Concepts/identifiers.htm)  of the compartment to contain the Service Gateway. 
+* `compartment_id` - (Required) The [OCID] (https://docs.cloud.oracle.com/iaas/Content/General/Concepts/identifiers.htm)  of the compartment to contain the Service Gateway. 
 * `defined_tags` - (Optional) (Updatable) Defined tags for this resource. Each key is predefined and scoped to a namespace. For more information, see [Resource Tags](https://docs.cloud.oracle.com/iaas/Content/General/Concepts/resourcetags.htm).  Example: `{"Operations.CostCenter": "42"}` 
 * `display_name` - (Optional) (Updatable) A user-friendly name. Does not have to be unique, and it's changeable. Avoid entering confidential information. 
 * `freeform_tags` - (Optional) (Updatable) Free-form tags for this resource. Each tag is a simple key-value pair with no predefined name, type, or namespace. For more information, see [Resource Tags](https://docs.cloud.oracle.com/iaas/Content/General/Concepts/resourcetags.htm).  Example: `{"Department": "Finance"}`