Corrected spelling mistake in nginx.mdx

Corrected a spelling mistake from nnginx to nginx in the line:

echo -e '#!/bin/bash\nnginx -t && systemctl reload nginx' | sudo tee /etc/letsencrypt/renewal-hooks/post/nginx-reload.sh && sudo chmod a+x /etc/letsencrypt/renewal-hooks/post/nginx-reload.sh

Author: FoamToaster

pages/reverse-proxies/nginx.mdx

@@ -214,12 +214,12 @@ sudo nginx -t
 ```
 ### Automatic reload Nginx when SSL Certificates are renewed:
 ```bash
-echo -e '#!/bin/bash\nnginx -t && systemctl reload nginx' | sudo tee /etc/letsencrypt/renewal-hooks/post/nginx-reload.sh && sudo chmod a+x /etc/letsencrypt/renewal-hooks/post/nginx-reload.sh
+echo -e '#!/bin/bash\nginx -t && systemctl reload nginx' | sudo tee /etc/letsencrypt/renewal-hooks/post/nginx-reload.sh && sudo chmod a+x /etc/letsencrypt/renewal-hooks/post/nginx-reload.sh
 ```
 ### Reload Nginx
 ```bash
 sudo systemctl reload nginx
 ```
 ### Vuola!
 Your Nginx reverse proxy is now running, securely serving your Postiz instance at your subdomain.domain.tld. 🎉
-</Steps>
+</Steps>