message: Add example loop command
diff: # =======================================================================
  # ssh -L 33007:shared-cluster.cluster-banana.ap-southeast-2.rds.amazonaws.com:3306 jumpbox.aws.amazee.io
  #
  -# Example commands
  -# ================
  +# Example command 1
  +# =================
  # ./helpers/shared-to-shared-migrate.sh \
  # --destination shared-cluster.cluster-apple.ap-southeast-2.rds.amazonaws.com \
  # --replica shared-cluster.cluster-r0-apple.ap-southeast-2.rds.amazonaws.com \
  # --namespace NAMESPACE \
  # --dry-run
  #
  +# Example command 2
  +# =================
  +# namespaces="
  +# foo-example-com-production
  +# bar-example-com-production
  +# baz-example-com-production
  +# quux-example-com-production
  +# "
  +# for namespace in $namespaces; do
  +# ./helpers/shared-to-shared-migrate.sh \
  +# --dry-run \
  +# --namespace "$namespace" \
  +# --destination shared-mysql-production-1-cluster.cluster-plum.ap-southeast-2.rds.amazonaws.com \
  +# --replica shared-mysql-production-1-cluster.cluster-ro-plum.ap-southeast-2.rds.amazonaws.com
  +# done
  +#
  set -euo pipefail
  # Initialize our own variables:
  