Update uninstall.md

(cherry picked from commit 2d61351)

Author: deliahu

docs/cluster-management/uninstall.md

@@ -27,10 +27,12 @@ If you modified your bash profile, you may wish to remove `source <(cortex compl
 export AWS_ACCESS_KEY_ID=***
 export AWS_SECRET_ACCESS_KEY=***
 
-# delete the S3 bucket
+# identify the name of your cortex s3 bucket
 aws s3 ls
-aws s3 rb --force s3://<bucket-name>
 
-# delete the log group
-aws logs describe-log-groups --log-group-name-prefix=<log_group_name> --query logGroups[*].[logGroupName] --output text | xargs -I {} aws logs delete-log-group --log-group-name {}
+# delete the s3 bucket
+aws s3 rb --force s3://<bucket>
+
+# delete the log group (replace <log_group> with what was configured during installation, default: cortex)
+aws logs describe-log-groups --log-group-name-prefix=<log_group> --query logGroups[*].[logGroupName] --output text | xargs -I {} aws logs delete-log-group --log-group-name {}
 ```