Add DockerUpdating.md changes from feature-nginx-combined

docs/getting-started/quick-start/tab-docker/DockerUpdating.md

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+
+
+# Docker Compose Setup
+
+Using Docker Compose simplifies the management of multi-container Docker applications.
+
+## Example `docker-compose.yml`
+
+```yaml
+version: '3'
+services:
+  openwebui:
+    image: ghcr.io/open-webui/open-webui:main
+    ports:
+      - "3000:8080"
+    volumes:
+      - open-webui:/app/backend/data
+volumes:
+  open-webui:
+```
+
+## Starting the Services
+
+To start your services, run:
+
+```bash
+docker compose up -d
+```
+
+---
+
+**Note:** For Nvidia GPU support, add the following to your service definition:
+
+```yaml
+deploy:
+  resources:
+    reservations:
+      devices:
+        - driver: nvidia
+          count: all
+          capabilities: [gpu]
+```