Add memo support info to doc comment

chipshort · mergify[bot] · commit 93fee4a6dc79 · 2024-03-11T15:36:52.000Z
(cherry picked from commit a6dae42)
diff --git a/packages/std/src/ibc.rs b/packages/std/src/ibc.rs
@@ -36,6 +36,7 @@ pub enum IbcMsg {
         /// when packet times out, measured on remote chain
         timeout: IbcTimeout,
         /// optional memo
+        /// This is only supported on CosmWasm 2.0 chains and ignored on older chains.
         memo: Option<String>,
     },
     /// Sends an IBC packet with given data over the existing channel.
