MicrosoftDocs/azure-docs#42461

-------
cc: @lenadroid

Author: mimckitt

articles/aks/spark-job.md

@@ -318,6 +318,7 @@ When running the job, instead of indicating a remote jar URL, the `local://` sch
     --name spark-pi \
     --class org.apache.spark.examples.SparkPi \
     --conf spark.executor.instances=3 \
+    --conf spark.kubernetes.authenticate.driver.serviceAccountName=spark \
     --conf spark.kubernetes.container.image=<spark-image> \
     local:///opt/spark/work-dir/<your-jar-name>.jar
 ```