Update comments

overlays/default.nix

@@ -4,7 +4,6 @@
   additions = final: _prev: import ../pkgs {pkgs = final;};
 
   # This one contains whatever you want to overlay
-  # You can change versions, add patches, set compilation flags, anything really.
   # https://nixos.wiki/wiki/Overlays
   selfsuper = (self: super: {
     mpv = super.mpv.override {
@@ -16,7 +15,7 @@
     # Patches go here
   });
 
-  # Unstable nixpkgs and nur through 'pkgs.unstable' and 'pkgs.nur'
+  # Unstable nixpkgs
   unstable-packages = final: _prev: {
     unstable = import inputs.nixpkgs-unstable {
       system = final.system;