DATAREDIS-1257 - Update redis-repositories documentation.

Update reading converter sample since it converts `Map` to an `Address`, it shall have opposite declaration.

Original Pull Request: #575

src/main/asciidoc/reference/redis-repositories.adoc

@@ -237,7 +237,7 @@ public class AddressToMapConverter implements Converter<Address, Map<String,byte
 }
 
 @ReadingConverter
-public class MapToAddressConverter implements Converter<Address, Map<String, byte[]>> {
+public class MapToAddressConverter implements Converter<Map<String, byte[]>, Address> {
 
   @Override
   public Address convert(Map<String,byte[]> source) {