docs: fix linux command of installing Nginx (#866)

Author: TnTomato

docs/kratos/guides/deploy-kratos-example.mdx

@@ -310,7 +310,7 @@ We'll use Nginx as reverse proxy and load balancer for our service. You can use
 Install Nginx by running:
 
 ```bash
-apt-get nginx certbot python3-certbot-nginx
+apt-get install nginx certbot python3-certbot-nginx
 ```
 
 Create a default configuration for the virtual host. To do this create the file `accounts.example.com` at