ddb4: improve formatting

Improve the consistency of the formatting.

Reviewed by:		ziaee
MFC after:		3 days
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D50514

share/man/man4/ddb.4

@@ -24,7 +24,7 @@
 .\" any improvements or extensions that they make and grant Carnegie Mellon
 .\" the rights to redistribute these changes.
 .\"
-.Dd November 10, 2022
+.Dd May 24, 2025
 .Dt DDB 4
 .Os
 .Sh NAME
@@ -590,7 +590,7 @@ Prints the address of the thread whose kernel-mode stack contains
 if any.
 .Pp
 .It Ic show Cm active trace
-.It acttrace
+.It Ic acttrace
 Show a stack trace for every thread running on a CPU.
 .Pp
 .It Ic show Cm all procs Ns Op Li / Ns Cm a