btrace(1) does not accept "-e file" Instead, it depends on filename as
the last parameter if no -b inline-script is specified. I also improved
the definition of "program".

diff --git a/usr.sbin/btrace/btrace.8 b/usr.sbin/btrace/btrace.8
index b233465185a..0ebd6eff061 100644
--- a/usr.sbin/btrace/btrace.8
+++ b/usr.sbin/btrace/btrace.8
@@ -23,9 +23,10 @@
 .Sh SYNOPSIS
 .Nm btrace
 .Op Fl lnv
-.Op Fl e Ar program | Ar file
+.Op Fl e Ar program
 .Op Fl p Ar file
 .Op Ar argument ...
+.Op Ar filename
 .Sh DESCRIPTION
 The
 .Nm
@@ -33,15 +34,17 @@ utility provides an interface to inspect the internals of the system and
 programs.
 It interprets the
 .Xr bt 5
-program in
-.Ar file
+.Ar program
+or
+.Ar filename
 and communicates with the dynamic tracer device using the interface described in
 .Xr dt 4 .
 .Pp
 The options are as follows:
 .Bl -tag -width Ds
 .It Fl e Ar program
-Execute
+Execute inline
+.Xr bt 5
 .Ar program .
 .It Fl l
 List all available probes.