Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: mnriem

docs/reference/authentication.md

@@ -22,7 +22,7 @@ Create `~/.specify/auth.json` to enable authentication:
 ```
 
 > **Security:** Restrict the file to owner-only access:
-> ```
+> ```bash
 > chmod 600 ~/.specify/auth.json
 > ```