docs: fix seerr version in nixpkg docs

Author: gauthier-th

docs/getting-started/nixpkg.mdx

@@ -47,7 +47,7 @@ export const VersionMismatchWarning = () => {
     <a href="https://github.com/NixOS/nixpkgs/blob/nixos-24.11/pkgs/servers/jellyseerr/default.nix#L14">
       upstream Jellyseerr Nix Package (v{nixpkgVersions.stable})
     </a>{' '}
-    is not <b>up-to-date</b>. If you want to use <b>Jellyseerr v{jellyseerrVersion}</b>,{' '}
+    is not <b>up-to-date</b>. If you want to use <b>Jellyseerr v{seerrVersion}</b>,{' '}
     {isUnstableUpToDate ? (
       <>
         consider using the{' '}