docs: generate sample code in the Java microgenerator (#437)

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Author: yoshi-automation

google-cloud-dataproc/src/main/java/com/google/cloud/dataproc/v1/AutoscalingPolicyServiceClient.java

@@ -23,24 +23,62 @@
  *
  * <p>Sample for AutoscalingPolicyServiceClient:
  *
+ * <pre>{@code
+ * try (AutoscalingPolicyServiceClient autoscalingPolicyServiceClient =
+ * AutoscalingPolicyServiceClient.create()) {
+ * LocationName parent = LocationName.of("[PROJECT]", "[LOCATION]");
+ * AutoscalingPolicy policy = AutoscalingPolicy.newBuilder().build();
+ * AutoscalingPolicy response =
+ * autoscalingPolicyServiceClient.createAutoscalingPolicy(parent, policy);
+ * }
+ * }</pre>
+ *
  * <p>======================= ClusterControllerClient =======================
  *
  * <p>Service Description: The ClusterControllerService provides methods to manage clusters of
  * Compute Engine instances.
  *
  * <p>Sample for ClusterControllerClient:
  *
+ * <pre>{@code
+ * try (ClusterControllerClient clusterControllerClient = ClusterControllerClient.create()) {
+ * String projectId = "projectId-894832108";
+ * String region = "region-934795532";
+ * String clusterName = "clusterName-1141738587";
+ * Cluster response = clusterControllerClient.getCluster(projectId, region, clusterName);
+ * }
+ * }</pre>
+ *
  * <p>======================= JobControllerClient =======================
  *
  * <p>Service Description: The JobController provides methods to manage jobs.
  *
  * <p>Sample for JobControllerClient:
  *
+ * <pre>{@code
+ * try (JobControllerClient jobControllerClient = JobControllerClient.create()) {
+ * String projectId = "projectId-894832108";
+ * String region = "region-934795532";
+ * Job job = Job.newBuilder().build();
+ * Job response = jobControllerClient.submitJob(projectId, region, job);
+ * }
+ * }</pre>
+ *
  * <p>======================= WorkflowTemplateServiceClient =======================
  *
  * <p>Service Description: The API interface for managing Workflow Templates in the Dataproc API.
  *
  * <p>Sample for WorkflowTemplateServiceClient:
+ *
+ * <pre>{@code
+ * try (WorkflowTemplateServiceClient workflowTemplateServiceClient =
+ * WorkflowTemplateServiceClient.create()) {
+ * LocationName parent = LocationName.of("[PROJECT]", "[LOCATION]");
+ * WorkflowTemplate template = WorkflowTemplate.newBuilder().build();
+ * WorkflowTemplate response =
+ * workflowTemplateServiceClient.createWorkflowTemplate(parent, template);
+ * }
+ * }</pre>
  */
 @Generated("by gapic-generator-java")
 package com.google.cloud.dataproc.v1;