devd/snd.conf: Note that any command can be used for the action

Sponsored by:	The FreeBSD Foundation
MFC after:	1 day
Differential Revision:	https://reviews.freebsd.org/D53175

sbin/devd/snd.conf

@@ -5,6 +5,9 @@ notify 0 {
 	match "type"		"IN";
 	match "cdev"		"dsp[0-9]+";
 
+	# Other audio servers or device switching commands can be used here
+	# instead of virtual_oss(8).
+	#
 	# FIXME: We are hardcoding /dev/vdsp.ctl here, simply because it is a
 	# common virtual_oss control device name. Until we find a proper way to
 	# define control devices here, /dev/vdsp.ctl can be changed to the
@@ -18,6 +21,6 @@ notify 0 {
 	match "type"		"OUT";
 	match "cdev"		"dsp[0-9]+";
 
-	# FIXME: See comment above.
+	# See comment above.
 	action			"/usr/sbin/virtual_oss_cmd /dev/vdsp.ctl -P /dev/$cdev";
 };