treesitter: wording

modules/plugins/treesitter/treesitter.nix

@@ -119,7 +119,7 @@ in {
         "sh" = ["ash" "dash"];
       };
       description = ''
-        Register alternative parser names for a filetype.
+        For each parser, registers a list of alternative filetypes.
         For more information see `:h vim.treesitter.language.register()`.
         See treesitter builtin mappings here: <https://github.com/nvim-treesitter/nvim-treesitter/blob/main/plugin/filetypes.lua>
       '';