mdo.1: Cross-reference with security.7

MFC after:	3 days
Reviewed by:	olce
Differential Revision:	https://reviews.freebsd.org/D56024

share/man/man7/security.7

@@ -26,7 +26,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd June 1, 2024
+.Dd March 22, 2026
 .Dt SECURITY 7
 .Os
 .Sh NAME
@@ -1099,6 +1099,7 @@ Enables mapping of simultaneously writable and executable pages for
 .Xr chflags 1 ,
 .Xr find 1 ,
 .Xr md5 1 ,
+.Xr mdo 1 ,
 .Xr netstat 1 ,
 .Xr openssl 1 ,
 .Xr proccontrol 1 ,