NodeDataLookup parameter valud needs to be valid JSON or YAML; it is not a string anymore

Consequently, all the references to the NodeDataLookup parameter in our docs (like [1] and [2]), where we use a notation like:

NodeDataLookup: |
  ...

(note the pipe after the colon)

need to be updated removing the pipe; then the actual value can either be kept in JSON format but pulled one line above OR converted into YAML format.

There is an upstream change implementing this same change at: https://review.openstack.org/#/c/635206/

1. https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/14/html-single/deploying_an_overcloud_with_containerized_red_hat_ceph/#map_disk_layout_non-homogen_ceph
2. https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/14/html-single/deploying_an_overcloud_with_containerized_red_hat_ceph/#proc_ceph-defining-crush-hierarchy-assembly_ceph-second-tier-storage