Where to find details on Bitcoin protocol version

Hey everyone I'm trying to send Bitcoin transactions using Python's socket library. I've figured out how to sign a transaction, but I'm stuck on what info I need to send when connecting to other nodes. The node I'm connecting to has a protocol version of 70016. I checked out bitcoin.org for info. I was looking at this page: https://developer.bitcoin.org/reference/p2p_networking.html#protocol-versions But it doesn’t really explain how version 70016 works. Anyone know where I can find info on this specific version of the Bitcoin protocol?