doc: update TPU topology link (GoogleCloudPlatform#14171)

Signed-off-by: David Xia <[email protected]>

Author: davidxia

mmv1/third_party/terraform/services/container/resource_container_node_pool.go.tmpl

@@ -200,7 +200,7 @@ var schemaNodePool = map[string]*schema.Schema{
 				"tpu_topology": {
 					Type:        schema.TypeString,
 					Optional:    true,
-					Description: `TPU placement topology for pod slice node pool. https://cloud.google.com/tpu/docs/types-topologies#tpu_topologies`,
+					Description: `The TPU topology like "2x4" or "2x2x2". https://cloud.google.com/kubernetes-engine/docs/concepts/plan-tpus#topology`,
 				},
 			},
 		},

mmv1/third_party/terraform/website/docs/r/container_node_pool.html.markdown

@@ -289,7 +289,7 @@ cluster.
   The resource policy must be in the same project and region as the node pool.
   If not found, InvalidArgument error is returned.
 
-* `tpu_topology` - (Optional) The [TPU placement topology](https://cloud.google.com/tpu/docs/types-topologies#tpu_topologies) for pod slice node pool.
+* `tpu_topology` - (Optional) The [TPU topology](https://cloud.google.com/kubernetes-engine/docs/concepts/plan-tpus#topology) like `"2x4"` or `"2x2x2"`.
 
 <a name="nested_queued_provisioning"></a> The `queued_provisioning` block supports: