Update Luau docs (#21174)

Formatter arguments & Tree-sitter grammar changed.

Release Notes:

- N/A

docs/src/languages/luau.md

@@ -5,7 +5,7 @@
 Luau language support in Zed is provided by the community-maintained [Luau extension](https://github.com/4teapo/zed-luau).
 Report issues to: [https://github.com/4teapo/zed-luau/issues](https://github.com/4teapo/zed-luau/issues)
 
-- Tree Sitter: [tree-sitter-grammars/tree-sitter-luau](https://github.com/tree-sitter-grammars/tree-sitter-luau)
+- Tree Sitter: [4teapo/tree-sitter-luau](https://github.com/4teapo/tree-sitter-luau)
 - Language Server: [JohnnyMorganz/luau-lsp](https://github.com/JohnnyMorganz/luau-lsp)
 
 ## Configuration
@@ -33,7 +33,7 @@ Then add the following to your Zed `settings.json`:
       "formatter": {
         "external": {
           "command": "stylua",
-          "arguments": ["-"]
+          "arguments": ["--stdin-filepath", "{buffer_path}", "-"]
         }
       }
     }