Update docker compose instruction, fix #1601

README.md

@@ -130,7 +130,7 @@ POSTGRES_DB=doccano
 After running the following command, access <http://127.0.0.1/>.
 
 ```bash
-docker-compose -f docker/docker-compose.prod.yml --env-file ./docker/.env.example up
+docker-compose -f docker/docker-compose.prod.yml --env-file .env up
 ```
 
 ### One-click Deployment

docs/install-and-upgrade-doccano.md

@@ -98,10 +98,10 @@ cd doccano
 To install and start doccano at <http://localhost>, run the following command:
 
 ```bash
-docker-compose -f docker/docker-compose.prod.yml --env-file ./docker/.env.example up
+docker-compose -f docker/docker-compose.prod.yml --env-file .env up
 ```
 
-You can override the default setting by rewriting the `.env` file.
+You can override the default setting by rewriting the `.env` file. See [./docker/.env.example](https://github.com/doccano/doccano/blob/master/docker/.env.example) in detail.
 
 ## Install from source