update placeholder text in Ingestion sample code (Azure#30696)

Author: scottaddie

sdk/monitor/azure-monitor-ingestion/src/samples/java/com/azure/monitor/ingestion/UploadLogsSample.java

@@ -21,12 +21,12 @@ public final class UploadLogsSample {
      */
     public static void main(String[] args) {
         LogsIngestionClient client = new LogsIngestionClientBuilder()
-                .endpoint("<data-collection-endpoint")
+                .endpoint("<data-collection-endpoint>")
                 .credential(new DefaultAzureCredentialBuilder().build())
                 .buildClient();
 
         List<Object> dataList = getLogs();
-        UploadLogsResult result = client.upload("<data-collection-rule-id", "stream-name", dataList);
+        UploadLogsResult result = client.upload("<data-collection-rule-id>", "<stream-name>", dataList);
         System.out.println(result.getStatus());
     }