docs: update for FreeBSD

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

README.md

@@ -86,6 +86,10 @@ $ lima nerdctl run -d --name nginx -p 127.0.0.1:8080:80 nginx:alpine
 
 NOTE: ARM Mac requires installing a patched version of QEMU, see [Lima](https://github.com/AkihiroSuda/lima) documentation.
 
+### FreeBSD
+
+See [`./docs/freebsd.md`](docs/freebsd.md).
+
 ### Windows
 
 - Linux containers: Known to work on WSL2
@@ -121,6 +125,7 @@ Minor:
 - Importing OCI archives as well as Docker archives: `nerdctl load` .
 - Specifying a non-image rootfs: `nerdctl run -it --rootfs <ROOTFS> /bin/sh` . The CLI syntax conforms to Podman convention.
 - Connecting a container to multiple networks at once: `nerdctl run --net foo --net bar`
+- Running [FreeBSD jails](./docs/freebsd.md).
 
 Trivial:
 - Inspecting raw OCI config: `nerdctl container inspect --mode=native` .
@@ -958,3 +963,4 @@ Others:
 - [`./docs/rootless.md`](./docs/rootless.md): Rootless mode
 - [`./docs/stargz.md`](./docs/stargz.md):     Lazy-pulling using Stargz Snapshotter
 - [`./docs/ocicrypt.md`](./docs/ocicrypt.md): Running encrypted images
+- [`./docs/freebsd.md`](./docs/freebsd.md):  Running FreeBSD jails

docs/freebsd.md

@@ -4,7 +4,7 @@
 | :zap:        FreeBSD runtimes are at the very early stage of development |
 |--------------------------------------------------------------------------|
 
-nerdctl provides experimental support for running FreeBSD jails.
+nerdctl provides experimental support for running FreeBSD jails on FreeBSD hosts.
 
 ## Installation