fix: correct Lua section anchor in nixpkgs manual (#1894)

Author: iamanaws

core/src/content/learning-manuals/02-nixpkgs-manual.mdx

@@ -28,9 +28,8 @@ The Nix Packages collection (Nixpkgs) is a set of thousands of packages for the
     [Rust](/manual/nixpkgs/stable/#rust) - [R](/manual/nixpkgs/stable/#r) -
     [Haskell](/manual/nixpkgs/stable/#haskell) -
     [Elm](/manual/nixpkgs/stable/#sec-elm) - [BEAM Languages (Erlang, Elixir,
-    LFE)](/manual/nixpkgs/stable/#sec-beam) -
-    [Lua](/manual/nixpkgs/stable/#users-guide-to-lua-infrastructure) -
-    [Idris](/manual/nixpkgs/stable/#idris) -
+    LFE)](/manual/nixpkgs/stable/#sec-beam) - [Lua](/manual/nixpkgs/stable/#lua)
+    - [Idris](/manual/nixpkgs/stable/#idris) -
     [Coq](/manual/nixpkgs/stable/#sec-language-coq) -
     [Perl](/manual/nixpkgs/stable/#sec-language-perl) -
     [OCaml](/manual/nixpkgs/stable/#sec-language-ocaml) -