Merge pull request #223843 from simplejack-src/nixos_manual_desktop_item

nixos/documentation: Fix desktopIcon, GenericName/Comment

nixos/modules/misc/documentation.nix

···
     desktopItem = pkgs.makeDesktopItem {
       name = "nixos-manual";
       desktopName = "NixOS Manual";
-      genericName = "View NixOS documentation in a web browser";
+      genericName = "System Manual";
+      comment = "View NixOS documentation in a web browser";
       icon = "nix-snowflake";
       exec = "nixos-help";
       categories = ["System"];