Documentation about displaying fields in invoice template mentions wrong address types

In the README file is explained how to display the extra fields in Ubercart's invoice template. It explain values of extra address fields are using the following pattern:

$uc_addresses_(address type)_(field name)

Then it says that (address_type) can be 'delivery' or 'billing'. This is wrong, because it should be 'shipping' or 'billing'. That's the terminology that Ubercart Addresses uses, at least.

I'm working on a patch.