Updated the wording around installing non-npm nodes in docker (n8n-io#2396)

Author: dkarzon

docs/integrations/creating-nodes/deploy/install-private-nodes.md

@@ -54,7 +54,7 @@ If you're running n8n using Docker, you need to create a Docker image with the n
 	EXPOSE 5678/tcp
 	```
 
-2. Copy your node and credential files into your container's `~/.n8n/custom/` directory. This makes them available to Docker.
+2. Compile your custom node code (`npm run build` if you are using nodes starter). Copy the **node** and **credential** folders from within the **dist** folder into your container's `~/.n8n/custom/` directory. This makes them available to Docker.
 
 3. Download the [docker-entrypoint.sh](https://github.com/n8n-io/n8n/blob/master/docker/images/n8n/docker-entrypoint.sh) file, and place it in the same directory as your Dockerfile.
 
@@ -70,4 +70,4 @@ You can now use your node in Docker.
 
 ## Install your node in a global n8n instance
 
-If you've installed n8n globally, make sure that you install your node inside n8n. n8n will find the module and load it automatically.
+If you've installed n8n globally, make sure that you install your node inside n8n. n8n will find the module and load it automatically.