Recent SoftDevices: version 7.3 (and 7.2): there are missing docs.
No info about changes in 7.2 and 7.3, I don't know whether changes are relevant or not worth the upgrade.
https://infocenter.nordicsemi.com/index.jsp?topic=%2Fstruct_nrf52%2Fstruct%2Fs132.html
Here, link to PDF with Specification (upper right corner): the same problem with PDF, no info about 7.2 and 7.3.