feat(printing): enable common drivers by default

docs/printing.md

@@ -1,7 +1,14 @@
 # Printing
 
-This repo enables the CUPS printing service via `modules/system/printer.nix`, but it does **not** bundle any
-printer driver packages by default.
+This repo enables the CUPS printing service via `modules/system/printer.nix` and includes a small common
+driver set by default.
+
+Enabled by default:
+
+- `pkgs.cups-filters`
+- `pkgs.cups-browsed`
+- `pkgs.gutenprint`
+- `pkgs.gutenprintBin`
 
 ## Opt into drivers from a host file
 
@@ -20,7 +27,7 @@ Add driver packages to `services.printing.drivers` in your host module. Example:
 
 ## Driver packages (cheat sheet)
 
-Generic / common:
+Generic / common (additional options):
 
 - `pkgs.gutenprint` — various printer drivers
 - `pkgs.gutenprintBin` — various binary printer drivers