fixed yet more silliness with incorrect .Nm macro calls

doc/man/isc/isc_time.3

@@ -14,7 +14,7 @@
 .\" NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 .\" WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.\" $Id: isc_time.3,v 1.2 2000/06/28 02:38:47 jim Exp $
+.\" $Id: isc_time.3,v 1.3 2000/06/28 02:40:45 jim Exp $
 .\"
 .Dd Jun 30, 2000
 .Dt ISC_TIME 3
@@ -118,7 +118,7 @@
 .Sh DESCRIPTION
 These functions are used by the name server for any time-related activities.
 They operate on the system's struct
-.Nm time_t
+.Dv time_t
 and two local data structures:
 .Bd -literal -offset indent
 struct isc_interval {
@@ -146,14 +146,13 @@ following functions.
 The function
 .Fn isc_interval_set
 initialises the
-.Nm isc_interval_t
+.Dv isc_interval_t
 pointed at by
 .Fa *i .
 The elements
-.Nm seconds
+.Dv seconds
 and
-.Nm
-nanoseconds
+.Dv nanoseconds
 are set to the values of
 .Fa seconds
 and