gsettings-desktop-schemas: Improve comments

pkgs/development/libraries/gsettings-desktop-schemas/default.nix

@@ -39,12 +39,17 @@ stdenv.mkDerivation rec {
     patchShebangs build-aux/meson/post-install.py
   '';
 
-  # meson installs the schemas to share/glib-2.0/schemas
-  # We add the override file there too so it will be compiled and later moved by
-  # glib's setup hook.
   preInstall = ''
+    # Meson installs the schemas to share/glib-2.0/schemas
+    # We add the override file there too so it will be compiled and later moved by
+    # glib's setup hook.
     mkdir -p $out/share/glib-2.0/schemas
     cat - > $out/share/glib-2.0/schemas/remove-backgrounds.gschema.override <<- EOF
+      # These paths are supposed to refer to gnome-backgrounds
+      # but since we do not use FHS, they are broken.
+      # And we do not want to hardcode the correct paths
+      # since then every GTK app would pull in gnome-backgrounds.
+      # Let’s just override the broken paths so that people are not confused.
       [org.gnome.desktop.background]
       picture-uri='''
       picture-uri-dark='''