systemd/example.conf: Being a little more specific in the comments regarding the environment variables.

systemd/example.conf

@@ -11,13 +11,13 @@
 # jackd`.
 #
 
-# The name of the
+# The name of the JACK server
 JACK_DEFAULT_SERVER="default"
-# options (e.g. -m, -n, -p, -r, -P, -t, -C, -u, -v)
+# Options to JACK (e.g. -m, -n, -p, -r, -P, -t, -C, -u, -v)
 JACK_OPTIONS=""
-# backends (e.g. alsa, dummy, firewire, netone, oss, portaudio)
+# Audio backend (e.g. alsa, dummy, firewire, netone, oss, portaudio)
 DRIVER="alsa"
-# the device name
+# Device name (used by the audio backend)
 DEVICE="hw:PCH,0"
-# specific settings for the driver in use
+# Specific settings for the audio backend in use
 DRIVER_SETTINGS=""