r1.91 added tags for all commands, but "del[ete]" is special in that
mandoc(1) will generate a tag for "del" only.
Add an explicit for the full command to fix this.
-.\" $OpenBSD: route.8,v 1.100 2021/08/30 15:46:07 kn Exp $
+.\" $OpenBSD: route.8,v 1.101 2021/10/22 18:31:12 kn Exp $
.\" $NetBSD: route.8,v 1.6 1995/03/18 15:00:13 cgd Exp $
.\"
.\" Copyright (c) 1983, 1991, 1993
.\"
.\" @(#)route.8 8.3 (Berkeley) 3/19/94
.\"
-.Dd $Mdocdate: August 30 2021 $
+.Dd $Mdocdate: October 22 2021 $
.Dt ROUTE 8
.Os
.Sh NAME
.Nm route
.Op Fl dnqtv
.Op Fl T Ar rtable
+.Tg delete
.Tg
.Cm del Ns Op Cm ete
.Op Ar modifiers