[SPARK-52653] Fix *.operatorContainer to *.operatorPod.operatorContainer in operations.md

[dongjoon-hyun]

What changes were proposed in this pull request?

This PR aims to fix the followings.

• operatorDeployment.operatorContainer.jvmArgs -> operatorDeployment.operatorPod.operatorContainer.jvmArgs
• operatorDeployment.operatorContainer.env -> operatorDeployment.operatorPod.operatorContainer.env
• operatorDeployment.operatorContainer.envFrom -> operatorDeployment.operatorPod.operatorContainer.envFrom
• operatorDeployment.operatorContainer.probes -> operatorDeployment.operatorPod.operatorContainer.probes
• operatorDeployment.operatorContainer.securityContext -> operatorDeployment.operatorPod.operatorContainer.securityContext
• operatorDeployment.operatorContainer.resources -> operatorDeployment.operatorPod.operatorContainer.resources

Why are the changes needed?

The previous path is wrong. We need to use new path like the following.

$ helm install spark spark/spark-kubernetes-operator --set operatorDeployment.operatorContainer.jvmArgs="-XX:+PrintFlagsFinal"
NAME: spark
LAST DEPLOYED: Wed Jul  2 07:48:18 2025
NAMESPACE: default
STATUS: deployed
REVISION: 1

$ kubectl get deploy spark-kubernetes-operator -oyaml | grep -C1 OPERATOR_JAVA_OPTS
          value: -Dlog4j.configurationFile=/opt/spark-operator/conf/log4j2.properties
        - name: OPERATOR_JAVA_OPTS
          value: -Dfile.encoding=UTF8

$ helm install spark spark/spark-kubernetes-operator --set operatorDeployment.operatorPod.operatorContainer.jvmArgs="-XX:+PrintFlagsFinal"

$ kubectl get deploy spark-kubernetes-operator -oyaml | grep -C1 OPERATOR_JAVA_OPTS
          value: -Dlog4j.configurationFile=/opt/spark-operator/conf/log4j2.properties
        - name: OPERATOR_JAVA_OPTS
          value: -XX:+PrintFlagsFinal

Does this PR introduce any user-facing change?

No, this is a documentation update.

How was this patch tested?

Manual review.

Was this patch authored or co-authored using generative AI tooling?

No.

[dongjoon-hyun]

Thank you, @peter-toth !

[dongjoon-hyun]

Also, cc @jiangzho

[dongjoon-hyun]

Merged to main.