doc: update OpenBSD build docs for 7.3 (external signer support available) #27449
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With OpenBSD 7.3, the waitid(2) system call is implemented (see openbsd/src@8112871, first mentioned kernel improvement at https://www.openbsd.org/73.html).
This means Boost.Process finally doesn't fail to compile anymore and we can remove the build hint about missing external signer support. Tested on my amd64 machine by reconfiguring / rebuilding master branch and successfully running the functional test wallet_signer.py. ✔️