Make zoned/jailed zfsprops(7) make more sense.

- Distribute zfs-[un]jail.8 on FreeBSD and zfs-[un]zone.8 on Linux
- zfsprops.7: mirror zoned/jailed, only available on respective platforms

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #15161

contrib/debian/openzfs-zfsutils.install

@@ -60,7 +60,6 @@ usr/share/man/man8/zfs-get.8
 usr/share/man/man8/zfs-groupspace.8
 usr/share/man/man8/zfs-hold.8
 usr/share/man/man8/zfs-inherit.8
-usr/share/man/man8/zfs-jail.8
 usr/share/man/man8/zfs-list.8
 usr/share/man/man8/zfs-load-key.8
 usr/share/man/man8/zfs-mount-generator.8
@@ -80,7 +79,6 @@ usr/share/man/man8/zfs-set.8
 usr/share/man/man8/zfs-share.8
 usr/share/man/man8/zfs-snapshot.8
 usr/share/man/man8/zfs-unallow.8
-usr/share/man/man8/zfs-unjail.8
 usr/share/man/man8/zfs-unload-key.8
 usr/share/man/man8/zfs-unmount.8
 usr/share/man/man8/zfs-unzone.8

man/Makefile.am

@@ -38,7 +38,6 @@ dist_man_MANS = \
 	%D%/man8/zfs-groupspace.8 \
 	%D%/man8/zfs-hold.8 \
 	%D%/man8/zfs-inherit.8 \
-	%D%/man8/zfs-jail.8 \
 	%D%/man8/zfs-list.8 \
 	%D%/man8/zfs-load-key.8 \
 	%D%/man8/zfs-mount.8 \
@@ -57,14 +56,11 @@ dist_man_MANS = \
 	%D%/man8/zfs-share.8 \
 	%D%/man8/zfs-snapshot.8 \
 	%D%/man8/zfs-unallow.8 \
-	%D%/man8/zfs-unjail.8 \
 	%D%/man8/zfs-unload-key.8 \
 	%D%/man8/zfs-unmount.8 \
-	%D%/man8/zfs-unzone.8 \
 	%D%/man8/zfs-upgrade.8 \
 	%D%/man8/zfs-userspace.8 \
 	%D%/man8/zfs-wait.8 \
-	%D%/man8/zfs-zone.8 \
 	%D%/man8/zfs_ids_to_path.8 \
 	%D%/man8/zgenhostid.8 \
 	%D%/man8/zinject.8 \
@@ -104,6 +100,18 @@ dist_man_MANS = \
 	%D%/man8/zstreamdump.8 \
 	%D%/man8/zpool_influxdb.8
 
+if BUILD_FREEBSD
+dist_man_MANS += \
+	%D%/man8/zfs-jail.8 \
+	%D%/man8/zfs-unjail.8
+endif
+
+if BUILD_LINUX
+dist_man_MANS += \
+	%D%/man8/zfs-unzone.8 \
+	%D%/man8/zfs-zone.8
+endif
+
 nodist_man_MANS = \
 	%D%/man8/zed.8 \
 	%D%/man8/zfs-mount-generator.8

man/man7/zfsprops.7

@@ -38,7 +38,7 @@
 .\" Copyright (c) 2019, Kjeld Schouten-Lebbing
 .\" Copyright (c) 2022 Hewlett Packard Enterprise Development LP.
 .\"
-.Dd April 18, 2023
+.Dd August 8, 2023
 .Dt ZFSPROPS 7
 .Os
 .
@@ -1916,13 +1916,15 @@ See
 for more information.
 Jails are a
 .Fx
-feature and are not relevant on other platforms.
+feature and this property is not available on other platforms.
-The default value is
+.It Sy zoned Ns = Ns Sy off Ns | Ns Sy on
-.Sy off .
-.It Sy zoned Ns = Ns Sy on Ns | Ns Sy off
 Controls whether the dataset is managed from a non-global zone or namespace.
-The default value is
+See
-.Sy off .
+.Xr zfs-zone 8
+for more information.
+Zoning is a
+Linux
+feature and this property is not available on other platforms.
 .El
 .Pp
 The following three properties cannot be changed after the file system is