Man pages matching name tshttptxnincomingaddrget in section 3ts:

TSHttpTxnIncomingAddrGet.3ts.en	debian 10 / trafficserver-dev
TSHttpTxnIncomingAddrGet.3ts.en	debian 11 / trafficserver-dev
TSHttpTxnIncomingAddrGet.3ts.en	debian 12 / trafficserver-dev