boot_*.8: reference installboot.8, rectify FFS note on sparc64

On sparc64, installboot(8) does not deal with any file system; its -p is a
NOOP and according to CVS history the old sys/arch/sparc64/installboot/
never prepared a file system, either.

Remove this single misleading mention alltogether and rely on the now
consistently cross-linked MI installboot(8) for details, if any.

This syncs the list of currently existing MD boot_*(8/*) pages with the list
of usr.sbin/installboot/*_installboot.c files.

boot_alpha(8/alpha) already references installboot(8) but still uses
sys/arch/alpha/stand/installboot/ instead of usr.sbin/installboot/.

boot_luna88k(8/luna88k) exists but luna88k does not use installboot at all.

installboot(8) has additional support for efi (armv7, arm64, riscv64),
landisk, loongson, octeon and powerpc64 but those architectures currently
lack their own MD boot_*(8/*) manual.

OK miod

3 files changed, 7 insertions, 9 deletions

diff --git a/share/man/man8/man8.hppa/boot_hppa.8 b/share/man/man8/man8.hppa/boot_hppa.8
index b4070bc9789..70d0eeb5c0d 100644
--- a/share/man/man8/man8.hppa/boot_hppa.8
+++ b/share/man/man8/man8.hppa/boot_hppa.8
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: boot_hppa.8,v 1.14 2010/01/03 16:43:45 schwarze Exp $
+.\"	$OpenBSD: boot_hppa.8,v 1.15 2022/09/05 10:29:27 kn Exp $
 .\"
 .\" Copyright (c) 2002, Miodrag Vallat.
 .\" All rights reserved.
@@ -24,7 +24,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: January 3 2010 $
+.Dd $Mdocdate: September 5 2022 $
 .Dt BOOT_HPPA 8 hppa
 .Os
 .Sh NAME
@@ -340,6 +340,7 @@ system bootstrap (usually also installed as
 .Xr dhcpd 8 ,
 .Xr halt 8 ,
 .Xr init 8 ,
+.Xr installboot 8 ,
 .Xr rbootd 8 ,
 .Xr reboot 8 ,
 .Xr savecore 8 ,
diff --git a/share/man/man8/man8.macppc/boot_macppc.8 b/share/man/man8/man8.macppc/boot_macppc.8
index 4a4fc699245..93e580b125d 100644
--- a/share/man/man8/man8.macppc/boot_macppc.8
+++ b/share/man/man8/man8.macppc/boot_macppc.8
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: boot_macppc.8,v 1.22 2022/09/05 10:03:50 kn Exp $
+.\"	$OpenBSD: boot_macppc.8,v 1.23 2022/09/05 10:29:27 kn Exp $
 .\"
 .\" Copyright (c) 1992, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -171,6 +171,7 @@ Apple HFS partition, to be readable by Open Firmware)
 .Xr boot_config 8 ,
 .Xr halt 8 ,
 .Xr init 8 ,
+.Xr installboot 8 ,
 .Xr reboot 8 ,
 .Xr savecore 8 ,
 .Xr shutdown 8
diff --git a/share/man/man8/man8.sparc64/boot_sparc64.8 b/share/man/man8/man8.sparc64/boot_sparc64.8
index 90d9339f93c..173d9d01a28 100644
--- a/share/man/man8/man8.sparc64/boot_sparc64.8
+++ b/share/man/man8/man8.sparc64/boot_sparc64.8
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: boot_sparc64.8,v 1.17 2022/08/04 09:16:53 kn Exp $
+.\"	$OpenBSD: boot_sparc64.8,v 1.18 2022/09/05 10:29:28 kn Exp $
 .\"
 .\" Copyright (c) 1992, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)boot_sparc.8	8.2 (Berkeley) 4/19/94
 .\"
-.Dd $Mdocdate: August 4 2022 $
+.Dd $Mdocdate: September 5 2022 $
 .Dt BOOT_SPARC64 8 sparc64
 .Os
 .Sh NAME
@@ -66,10 +66,6 @@ respectively.
 The second-stage boot program commonly resides in the root directory as
 .Pa /ofwboot .
 .Pp
-System boot blocks are installed using
-.Xr installboot 8 ,
-which prepares an FFS filesystem partition for boot-strapping from the PROM.
-.Pp
 The boot program attempts to load the kernel from the selected
 boot device, which must currently be an SCSI
 .Pq Pa sd