Removed version key from docker-compose.yml and docs

docs/docs/04_docker_intro/04_run_with_docker_compose/README.md

@@ -13,7 +13,6 @@ If you have Docker Desktop installed, you already have Docker Compose. If you wa
 Create a file called `docker-compose.yml` in the root of your project (alongside your `Dockerfile`). Inside it, add the following contents:
 
 ```yaml
-version: '3'
 services:
   web:
     build: .

docs/docs/04_docker_intro/04_run_with_docker_compose/end/docker-compose.yml

@@ -1,4 +1,3 @@
-version: '3'
 services:
   web:
     build: .

docs/docs/11_deploy_to_render/06_run_everything_docker_compose/README.md

@@ -5,7 +5,6 @@ Up until now we've been running `docker compose up` to start the REST API contai
 Now let's modify our `docker-compose.yml` file to include spinning up a new PostgreSQL database.
 
 ```yaml
-version: '3'
 services:
   web:
     build: .

docs/docs/11_deploy_to_render/06_run_everything_docker_compose/end/docker-compose.yml

@@ -1,4 +1,3 @@
-version: '3'
 services:
   web:
     build: .