android-udev-rules: move usage to longDescription, cleanup (#431037)

pkgs/by-name/an/android-udev-rules/package.nix

···
   fetchFromGitHub,
   udevCheckHook,
 }:
-
-## Usage
-# In NixOS, simply add this package to services.udev.packages:
-#   services.udev.packages = [ pkgs.android-udev-rules ];
-
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "android-udev-rules";
   version = "20250525";
 
   src = fetchFromGitHub {
     owner = "M0Rf30";
     repo = "android-udev-rules";
-    rev = version;
+    rev = finalAttrs.version;
     hash = "sha256-4ODU9EoVYV+iSu6+M9ePed45QkOZgWkDUlFTlWJ8ttQ=";
   };
 
···
   ];
   doInstallCheck = true;
 
-  meta = with lib; {
+  meta = {
     homepage = "https://github.com/M0Rf30/android-udev-rules";
     description = "Android udev rules list aimed to be the most comprehensive on the net";
-    platforms = platforms.linux;
-    license = licenses.gpl3Plus;
-    maintainers = with maintainers; [ abbradar ];
+    longDescription = ''
+      Android udev rules list aimed to be the most comprehensive on the net.
+      To use on NixOS, simply add this package to services.udev.packages:
+      ```nix
+      services.udev.packages = [ pkgs.android-udev-rules ];
+      ```
+    '';
+    platforms = lib.platforms.linux;
+    license = lib.licenses.gpl3Plus;
+    maintainers = [ lib.maintainers.abbradar ];
     teams = [ lib.teams.android ];
   };
-}
+})