docs: remove leftover backtick (#4)

README.md

@@ -36,7 +36,6 @@ You can then configure it like:
     openFirewall = true;
   };
 }
-
 ```
 
 For more options, see [`./docs/nixos-options.md`](./docs/nixos-options.md).
@@ -57,7 +56,7 @@ If you want to help out, here's a brief guide:
 
 3. To fetch the hash for the latest version, run:
    ```command
-   NIXPKGS_ALLOW_UNFREE=1 nix build --impure .#packages.x86_64-linux.default`
+   NIXPKGS_ALLOW_UNFREE=1 nix build --impure .#packages.x86_64-linux.default
    ```
 
 4. The build will error out, warning about a mismatched hash; update `src.hash` to the new hash.