net.box console support was deprecated more than three years ago, in
commit bd06e32a ("netbox: deprecate
console support"). Let's drop it, because it'll greatly simply rewriting
the net.box state machine in C.

@TarantoolBot document
Title: Delete documentation entry for net.box console

net.box console support, which was deprecated in 1.10, was dropped.
Now, one has to use `require('console').connect(host, port)` instead
of `require('net.box').connect(host, port, {console = true})`.