add update step

Author: devalog

fern/products/docs/pages/enterprise/self-hosted.mdx

@@ -32,9 +32,10 @@ However, features requiring external connections aren't supported, including [As
 Fern provides your documentation site as a ready-to-run Docker container that you can deploy on your own infrastructure.
 
 1. **Download the Docker image** - Fern provides the location of the most up-to-date Docker image containing the documentation frontend
-2. **Upload your fern folder** - Add your documentation source files to the container
-3. **Run the container** - Spin up your local server using standard Docker commands
-4. **Configure hosting** - Set up your server environment and decide how to publish/share the documentation
+1. **Upload your fern folder** - Add your documentation source files to the container
+1. **Run the container** - Spin up your local server using standard Docker commands
+1. **Configure hosting** - Set up your server environment and decide how to publish/share the documentation
+1. **Receive updated Docker images** - Fern releases new versions of the Docker image that your team can evaluate and deploy when ready.
 
 ### Architecture Diagram
 
@@ -48,6 +49,9 @@ sequenceDiagram
     C->>S: Upload fern folder
     C->>S: Run Docker command
     S->>S: Host documentation locally
+    F->>C: Releases updated Docker image
+    C->>C: Evaluate new version
+    C->>S: Deploy updated image
 ```