mptutil: correct man page date

PR:             279201
Fixes:          9a49a37 ("mptutil: document that disabled/enab...")
Sponsored by:   The FreeBSD Foundation

usr.sbin/mptutil/mptutil.8

@@ -27,7 +27,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd May 24, 2024
+.Dd May 24, 2023
 .Dt MPTUTIL 8
 .Os
 .Sh NAME