hotfix: download macos formatting

src/content/download/02-nix-macos.mdx

@@ -9,9 +9,11 @@ platform: macos
 > **Updating to macOS 15 Sequoia**
 >
 > If you recently updated to macOS 15 Sequoia and are getting
+>
 > ```console
 > error: the user '_nixbld1' in the group 'nixbld' does not exist
 > ```
+>
 > when running Nix commands, refer to GitHub issue [NixOS/nix#10892](https://github.com/NixOS/nix/issues/10892) for instructions to fix your installation without reinstalling.
 
 Install Nix via the **recommended** [multi-user installation](/manual/nix/stable/installation/multi-user):