update some option descriptions

modules/features/shells.nix

@@ -2,7 +2,7 @@
   imports = [ (inputs.helpers.mkMirroredModulesFlakeModule "globalOptions" ({ lib, ... }: {
     options.features.shells.defaultShell = lib.mkOption {
       type = inputs.helpers.mkEnumFromDirContents "${self}/modules/features/shells";
-      description = "This option controls the shell that should be used as the default, enabling that shell in the process.";
+      description = "The shell that should be used as the default for all users.";
       default = "zsh";
     };
   })) ];