updating commands and code

Hello I would thank you for this fruitful workshop. I corrected in my case the command and code below, hopefully you can update it in your repository hence other people will use it .
module 3 -> step 2
1- the code:
in operations/code-pipeline-cloudformation.yaml change the reference to the secret manager, the right declaration is the following :'{{resolve:service-name:reference-key}}'
2-Command:
```
aws cloudformation create-stack --stack-name docker-compose-code-pipeline --template-body file://operations/code-pipeline-cloudformation.yaml --capabilities CAPABILITY_NAMED_IAM --enable-termination-protection --region us-east-1 --parameters ParameterKey=DockerPullSecretsManagerArn,ParameterValue=${DOCKER_PULL_SECRETS_MANAGER} ParameterKey=GitHubOwner,ParameterValue=GitHubOwner='your GitHub username'
```

Start with operations/code-pipeline-cloudformation.yaml and the Module 3, step 2 instructions. Check the secret-manager reference in that template and locate the documented aws cloudformation create-stack command; done means both examples reflect the reported syntax and parameters.

Written by the indexing model from the issue text.