message: Fix ambiguity in TimeoutTimestamp docs
  Also see
diff: @@ -377,7 +377,7 @@ export interface AminoMsgTransfer extends AminoMsg {
  */
  readonly timeout_height: AminoHeight;
  /**
  - * Timeout timestamp (in nanoseconds). The timeout is disabled when set to 0.
  + * Timeout timestamp in absolute nanoseconds since unix epoch. The timeout is disabled when set to 0.
  *
  * 0 values must be omitted (https://github.com/cosmos/cosmos-sdk/blob/v0.42.7/x/ibc/applications/transfer/types/tx.pb.go#L52).
  */
  