Incorporate PR review fixes

src/bdk.udl

@@ -136,6 +136,7 @@ callback interface Progress {
 interface Wallet {
   [Throws=BdkError]
   constructor(string descriptor, string? change_descriptor, Network network, DatabaseConfig database_config);
+  [Throws=BdkError]
   AddressInfo get_address(AddressIndex address_index);
   [Throws=BdkError]
   u64 get_balance();