feat: Add Lustre support to the Vertex Training Custom Job API (#8822)

* feat: Add Lustre support to the Vertex Training Custom Job API
docs: Update comments for machine resources and autoscaling

PiperOrigin-RevId: 846415033

Source-Link: googleapis/googleapis@affadb6

Source-Link: googleapis/googleapis-gen@ef55c62
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AiPlatform/metadata/V1/CustomJob.php

@@ -38,13 +38,11 @@
  * @param string $formattedParent                                         The parent location resource where this DeploymentResourcePool
  *                                                                        will be created. Format: `projects/{project}/locations/{location}`
  *                                                                        Please see {@see DeploymentResourcePoolServiceClient::locationName()} for help formatting this field.
- * @param int    $deploymentResourcePoolDedicatedResourcesMinReplicaCount Immutable. The minimum number of machine replicas this
- *                                                                        DeployedModel will be always deployed on. This value must be greater than
- *                                                                        or equal to 1.
+ * @param int    $deploymentResourcePoolDedicatedResourcesMinReplicaCount Immutable. The minimum number of machine replicas that will be
+ *                                                                        always deployed on. This value must be greater than or equal to 1.
  *
- *                                                                        If traffic against the DeployedModel increases, it may dynamically be
- *                                                                        deployed onto more replicas, and as traffic decreases, some of these extra
- *                                                                        replicas may be freed.
+ *                                                                        If traffic increases, it may dynamically be deployed onto more replicas,
+ *                                                                        and as traffic decreases, some of these extra replicas may be freed.
  * @param string $deploymentResourcePoolId                                The ID to use for the DeploymentResourcePool, which
  *                                                                        will become the final component of the DeploymentResourcePool's resource
  *                                                                        name.

AiPlatform/metadata/V1/MachineResources.php

@@ -36,13 +36,11 @@
 /**
  * Update a DeploymentResourcePool.
  *
- * @param int $deploymentResourcePoolDedicatedResourcesMinReplicaCount Immutable. The minimum number of machine replicas this
- *                                                                     DeployedModel will be always deployed on. This value must be greater than
- *                                                                     or equal to 1.
+ * @param int $deploymentResourcePoolDedicatedResourcesMinReplicaCount Immutable. The minimum number of machine replicas that will be
+ *                                                                     always deployed on. This value must be greater than or equal to 1.
  *
- *                                                                     If traffic against the DeployedModel increases, it may dynamically be
- *                                                                     deployed onto more replicas, and as traffic decreases, some of these extra
- *                                                                     replicas may be freed.
+ *                                                                     If traffic increases, it may dynamically be deployed onto more replicas,
+ *                                                                     and as traffic decreases, some of these extra replicas may be freed.
  */
 function update_deployment_resource_pool_sample(
     int $deploymentResourcePoolDedicatedResourcesMinReplicaCount