smp.4: Use .Dv for a tunable.

diff --git a/share/man/man4/smp.4 b/share/man/man4/smp.4
index 638c130..fd6ad75 100644 (file)
--- a/share/man/man4/smp.4
+++ b/share/man/man4/smp.4
@@ -36,7 +36,7 @@ The
 .Nm
 kernel implements symmetric multiprocessor support.
 APIC I/O can be enabled or disabled by setting the
-.Dv hw.ioapic_enable
+.Va hw.ioapic_enable
 loader tunable (default is enabled).
 .Sh COMPATIBILITY
 The