Fixed a single typo (#133)

Corrected "Cconclusion" to "Conclusion"

docs/nixos-with-flakes/nixos-with-flakes-enabled.md

@@ -120,7 +120,7 @@ Currently, our flake includes these files:
 - `/etc/nixos/hardware-configuration.nix`: This is the system hardware configuration file,
   generated by NixOS, which describes the system's hardware information.
 
-## Cconclusion
+## Conclusion
 
 Up to this point, we have merely added a very simple configuration file,
 `/etc/nixos/flake.nix`, which has merely been a thin wrapper around