rc.conf(5): describe devmatch rc variables

Reviewed by:	imp, gbe (manpages)
MFC after:	3 days
Differential Revision: https://reviews.freebsd.org/D28048

share/man/man5/rc.conf.5

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd Sep 21, 2020
+.Dd January 10, 2021
 .Dt RC.CONF 5
 .Os
 .Sh NAME
@@ -251,6 +251,16 @@ Configuration file for
 .Xr ddb 8 .
 Default
 .Pa /etc/ddb.conf .
+.It Va devmatch_enable
+.Pq Vt bool
+If set to
+.Dq Li NO ,
+disable auto-loading of kernel modules with
+.Xr devmatch 8 .
+.It Va devmatch_blacklist
+.Pq Vt str
+A whitespace-separated list of kernel modules to be ignored by
+.Xr devmatch 8 .
 .It Va kld_list
 .Pq Vt str
 A whitespace-separated list of kernel modules to load right after