docs: update n8n URL for Ollama (#12994)

docs/integrations/n8n.mdx

@@ -25,8 +25,23 @@ Install [n8n](https://docs.n8n.io/choose-n8n/).
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-3. Confirm Base URL is set to `http://localhost:11434` and click **Save**
-<Note> If connecting to `http://localhost:11434` fails, use `http://127.0.0.1:11434`</Note>
+3. Confirm Base URL is set to `http://localhost:11434` if running locally or `http://host.docker.internal:11434` if running through docker and click **Save**
+
+<Note> 
+In environments that don't use Docker Desktop (ie, Linux server installations), `host.docker.internal` is not automatically added. 
+
+Run n8n in docker with `--add-host=host.docker.internal:host-gateway` 
+
+or add the following to a docker compose file:
+
+```yaml
+extra_hosts:
+  - "host.docker.internal:host-gateway"
+```
+</Note>
+
+You should see a `Connection tested successfully` message.
+
 4. When creating a new workflow, select **Add a first step** and select an **Ollama node** 
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   <img