gpart: Stop documenting freebsd-vinum partition types

Support for the partition types is still retained so that tools can
display existing partitions.

Reviewed by:	imp, emaste
Differential Revision:	https://reviews.freebsd.org/D48535

lib/geom/part/gpart.8

@@ -22,7 +22,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd September 2, 2024
+.Dd February 11, 2025
 .Dt GPART 8
 .Os
 .Sh NAME
@@ -681,15 +681,6 @@ The scheme-specific types are
 for APM, and
 .Qq Li "!516e7cb6-6ecf-11d6-8ff8-00022d09712b"
 for GPT.
-.It Cm freebsd-vinum
-A
-.Fx
-partition that contains a Vinum volume.
-The scheme-specific types are
-.Qq Li "!FreeBSD-Vinum"
-for APM, and
-.Qq Li "!516e7cb8-6ecf-11d6-8ff8-00022d09712b"
-for GPT.
 .It Cm freebsd-zfs
 A
 .Fx