nixos/plasma5: use vlc phonon backend by default

nixos/doc/manual/from_md/release-notes/rl-2305.section.xml

@@ -914,6 +914,14 @@
           (<link linkend="opt-services.fwupd.daemonSettings"><literal>services.fwupd.daemonSettings</literal></link>).
         </para>
       </listitem>
+      <listitem>
+        <para>
+          <literal>services.xserver.desktopManager.plasma5.phononBackend</literal>
+          now defaults to vlc according to
+          <link xlink:href="https://community.kde.org/Distributions/Packaging_Recommendations#Non-Plasma_packages">upstrean
+          recommendation</link>
+        </para>
+      </listitem>
       <listitem>
         <para>
           The <literal>zramSwap</literal> is now implemented with

nixos/doc/manual/release-notes/rl-2305.section.md

@@ -223,6 +223,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - The `services.fwupd` module now allows arbitrary daemon settings to be configured in a structured manner ([`services.fwupd.daemonSettings`](#opt-services.fwupd.daemonSettings)).
 
+- `services.xserver.desktopManager.plasma5.phononBackend` now defaults to vlc according to [upstrean recommendation](https://community.kde.org/Distributions/Packaging_Recommendations#Non-Plasma_packages)
+
 - The `zramSwap` is now implemented with `zram-generator`, and the option `zramSwap.numDevices` for using ZRAM devices as general purpose ephemeral block devices has been removed.
 
 - As Singularity has renamed to [Apptainer](https://apptainer.org/news/community-announcement-20211130)

nixos/modules/services/x11/desktop-managers/plasma5.nix

@@ -90,8 +90,8 @@ in
 
     phononBackend = mkOption {
       type = types.enum [ "gstreamer" "vlc" ];
-      default = "gstreamer";
-      example = "vlc";
+      default = "vlc";
+      example = "gstreamer";
       description = lib.mdDoc "Phonon audio backend to install.";
     };