PubkeyAuthentication value "unbound|host-bound" in ssh_config(5) Re: Call for testing: OpenSSH 8.9

[HARUYAMA Seigo]

>  * ssh(1): extend the PubkeyAuthentication configuration directive to
>    accept yes|no|unbound|host-bound to allow control over one of the
>    protocol extensions used to implement agent-restricted keys.

The description of PubkeyAuthentication value "unbound|host-bound" does not exist in ssh_config(5).

https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/ssh_config.5?rev=1.368&content-type=text/x-cvsweb-markup
https://github.com/openssh/openssh-portable/blob/ad16a84e64a8cf1c69c63de3fb9008320a37009c/ssh_config.5#L1520