Add insmod manpage and fix insmod usage

insmod.8

@@ -0,0 +1,10 @@
+.TH INSMOD 8 ubase-VERSION
+.SH NAME
+\fBinsmod\fR - Insert a module into the Linux kernel
+.SH SYNOPSIS
+\fBinsmod\fR filename [\fIargs...\fR]
+.SH DESCRIPTION
+\fBinsmod\fR inserts a module into the kernel.  It does not handle
+module dependencies.
+.SH SEE ALSO
+rmmod(8), lsmod(8)

insmod.c

@@ -11,7 +11,7 @@
 static void
 usage(void)
 {
-	eprintf("usage: %s module [args]\n", argv0);
+	eprintf("usage: %s filename [args...]\n", argv0);
 }
 
 int