pulseaudio: mention autospawn=no for client config

Inspired by discussin in [1]. Credit to aeadio for the specific
suggestion.

[1] #406

Author: ericonr

src/config/media/pulseaudio.md

@@ -19,6 +19,11 @@ terminal as follows:
 $ pulseaudio --daemonize=no --exit-idle-time=-1
 ```
 
+On the other hand, PulseAudio can also end up being auto activated when it isn't
+desired. To inhibit this behavior, the `autospawn` directive from
+[pulse-client.conf(5)](https://man.voidlinux.org/pulse-client.conf.5) can be set
+to `no`.
+
 There are several methods of allowing PulseAudio to access to audio devices. The
 simplest one is to add your user to the `audio` group. Alternatively, you can
 use a session manager, like `elogind`.