Fixed typo (#1511)

Author: fabriziofiorucci

content/agent/installation-upgrade/container-environments/docker-images.md

@@ -15,7 +15,7 @@ If you want to use NGINX Agent with NGINX Plus, you need to purchase an NGINX Pl
 
 See the requirements and supported operating systems in the [NGINX Agent Technical Specifications]({{< ref "/agent/technical-specifications.md" >}}) topic.
 
-## Deploy Offical NGINX and NGINX Plus Containers
+## Deploy Official NGINX and NGINX Plus Containers
 
 Docker images are available in the [Deploying NGINX and NGINX Plus on Docker](https://docs.nginx.com/nginx/admin-guide/installing-nginx/installing-nginx-docker/) NGINX documentation.