agp.4: Bump deprecation to 16.0

It was not actually removed prior to FreeBSD 15.0.

Sponsored by:	The FreeBSD Foundation

share/man/man4/agp.4

@@ -22,7 +22,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd November 28, 2007
+.Dd October 24, 2025
 .Dt AGP 4
 .Os
 .Sh NAME
@@ -34,7 +34,7 @@
 The
 .Nm
 driver is slated to be removed in
-.Fx 15.0 .
+.Fx 16.0 .
 .Sh DESCRIPTION
 The
 .Nm