Update README.md

Same issue as in Cookbook 248: #72

341-metrics-with-apm-daemonset-pod-agent-on-eks/README.md

@@ -47,8 +47,8 @@ It is not required for CMX metric. Any APM instrumentation configuration file (e
 3. In the snippet below, replace the token **{{ecr_region}}** and **{{aws_account_id}}** with your own values. Execute the snippet to build the image locally, and then push it to the ECR container registry. The build is based on a [Dockerfile](Dockerfile). 
 
 ```shell
-ecr_region = "{{ecr_region}}"  # replace {{ecr_region}}, for example: eu-west-3
-aws_account_id = "{{aws_account_id}}"  # replace {{aws_account_id}}, for example: 1234-5678-90
+ecr_region="{{ecr_region}}"  # replace {{ecr_region}}, for example: eu-west-3
+aws_account_id="{{aws_account_id}}"  # replace {{aws_account_id}}, for example: 1234-5678-90
 
 # 1. Connect docker to the ECR repository
 aws ecr get-login-password --region $ecr_region | docker login --username AWS --password-stdin $aws_account_id.dkr.ecr.$ecr_region.amazonaws.com
@@ -108,8 +108,8 @@ Same as in Step 3, replace the token **{{ecr_region}}** and **{{aws_account_id}}
 The build is based on this [Dockerfile](app/Dockerfile).
 
 ```shell
-ecr_region = "{{ecr_region}}"  # replace {{ecr_region}}, for example: eu-west-3
-aws_account_id = "{{aws_account_id}}"  # replace {{aws_account_id}}, for example: 1234-5678-90
+ecr_region="{{ecr_region}}"  # replace {{ecr_region}}, for example: eu-west-3
+aws_account_id="{{aws_account_id}}"  # replace {{aws_account_id}}, for example: 1234-5678-90
 
 # 1. Connect docker to the ECR repository
 aws ecr get-login-password --region $ecr_region | docker login --username AWS --password-stdin $aws_account_id.dkr.ecr.$ecr_region.amazonaws.com