documentation: use tt_address in own extension

[joka123]

Bug Report

Current BehaviorA clear and concise description of the behavior. the example code under https://github.com/FriendsOfTYPO3/tt_address/tree/master/Documentation/Tutorials/UsageOfAddressRepository is not working under typo3 12

can you update the code - this was really helpful thanks a lot for your work

[georgringer]

fixed the example