Add more comments for try_get_object_before_version

crates/iota-json-rpc-api/src/read.rs

@@ -88,6 +88,12 @@ pub trait ReadApi {
     /// version exists/existed. The result may vary across nodes depending
     /// on their pruning policies. Returns the latest object information
     /// with a version less than or equal to the given version
+    /// Note that this endpoint is used by sui replay tool. Also the
+    /// implementation in `iota-json-rpc` uses internally the
+    /// `AuthorityState::find_object_lt_or_eq_version` method, which has
+    /// underlying utility, (e.g., `RemoteFetcher::get_child_object` uses
+    /// `try_get_object_before_version` to get the object with the versions <=
+    /// the given version). Thus we keep this endpoint for now.
     #[method(name = "tryGetObjectBeforeVersion", deprecated = "true")]
     async fn try_get_object_before_version(
         &self,