about: fix typo

content/about.md

@@ -58,7 +58,7 @@ provide a collection of necessary improvements over CppNix:
 - **A language with room to grow.**  
   Unlike upstream Nix, Lix intends to be an evolving language -- a robust language versioning
   system will allow the language to grow and evolve without sacrificing backwards-compatibility or correctness.
-  And room to grow means room for **usability and ergonomics improvements** -- both in the langauge and in
+  And room to grow means room for **usability and ergonomics improvements** -- both in the language and in
   tooling.
   
 

content/add-to-config.md

@@ -83,7 +83,7 @@ Add the following to any NixOS module in your configuration (e.g. `configuration
 
 ```nix
 {
-  nix.settings.extra-substituters = [
+  nix.settings.substituters = [
     "https://cache.lix.systems"
   ];
 
@@ -152,7 +152,7 @@ Add the following to any NixOS module in your configuration (e.g. `configuration
 
 ```nix
 {
-  nix.settings.extra-substituters = [
+  nix.settings.substituters = [
     "https://cache.lix.systems"
   ];