Reference uefi(8) from i386 boot(8)

Suggested by trasz.

Differential Revision: https://reviews.freebsd.org/D1162

sbin/reboot/boot_i386.8

@@ -36,7 +36,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd July 1, 2013
+.Dd November 14, 2014
 .Dt BOOT 8 i386
 .Os
 .Sh NAME
@@ -56,6 +56,11 @@ Some BIOSes allow
 you to change this default sequence, and may also include a CD-ROM
 drive as a boot device.
 .Pp
+Some newer PCs boot using UEFI firmware, not BIOS.
+That process is described
+in
+.Xr uefi 8 .
+.Pp
 By default, a three-stage bootstrap is employed, and control is
 automatically passed from the boot blocks (bootstrap stages one and
 two) to a separate third-stage bootstrap program,
@@ -355,7 +360,8 @@ requirement has not been adhered to.
 .Xr loader 8 ,
 .Xr nextboot 8 ,
 .Xr reboot 8 ,
-.Xr shutdown 8
+.Xr shutdown 8 ,
+.Xr uefi 8
 .Sh BUGS
 The bsdlabel format used by this version of
 .Bx