chore: clarify owner/initiator relation for Op::Ddl

Summary

• chore: clarify owner/initiator relation for Op::Ddl

---

• Close #...
• Target branch: master
• Changes should be cherry-picked to 24.1: yes / no
• Docs follow-up: not necessary / new issue

src/traft/op.rs

@@ -485,6 +485,11 @@ pub struct DmlInLua {
 // Ddl
 ////////////////////////////////////////////////////////////////////////////////
 
+/// Represents Ddl operations performed on the cluster.
+///
+/// Note: for the purpose of audit log in some variants we keep initiator field.
+/// For Create<...> operations initiator and owner are the same,
+/// so owner is used to avoid duplication.
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
 #[serde(rename_all = "snake_case")]
 #[serde(tag = "kind")]