Improve documentation with better example code

[dambott]

I suggest making the first cloudformation easier to read

e.g. change it to something like this:

export REGION=US2
export ROLENAME=myCloudwatchMetricsRole
export EXTERNALSECRET=abc123
export COMPANYID=7000750

aws cloudformation deploy --capabilities CAPABILITY_IAM  CAPABILITY_NAMED_IAM \
        --template-file template.yaml  \
        --stack-name $STACKNAME  \
        --parameter-overrides \ 
                CoralogixRegion=$REGION \
                RoleName=$ROLENAME \
                ExternalIdSecret=$EXTERNALSECRET \
                CoralogixCompanyId=$COMPANYID