[Bug 273851] missing documentation for udp_set_kernel_tunneling

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273851

            Bug ID: 273851
           Summary: missing documentation for udp_set_kernel_tunneling
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Manual Pages
          Assignee: bugs@FreeBSD.org
          Reporter: freebsd@igalic.co
                CC: doc@FreeBSD.org

Watching kp@'s https://2023.eurobsdcon.org/program/ talk about if_opvn.
So i decided to look up some APIs he mentions.

udp_set_kernel_tunneling(9) and its related functions aren't documented.

I reckon these functions from sys/udp_var.h are the related ones:

```
int             udp_ctloutput(struct socket *, struct sockopt *);
void            udplite_input(struct mbuf *, int);
struct inpcb    *udp_notify(struct inpcb *inp, int errno);
int             udp_shutdown(struct socket *so);

int             udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f,
                    udp_tun_icmp_t i, void *ctx);
```

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