[Install OpenStack in charm-deployment-guide] ceph-osd disk devices is incorrect in yaml

[Brandon Castillo]

This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes:

- [x] This doc is inaccurate in this way: Incorrect ceph-osd devices
- [ ] This is a doc addition request.
- [x] I have a fix to the document that I can paste below including example: input and output.

# In guide
ceph-osd:
  osd-devices: /dev/sda /dev/sdb /dev/sdc /dev/sdd

# Fix
ceph-osd:
  osd-devices: /dev/sdb /dev/sdc

This would also require an update in the ceph-mon.yaml

# In guide
ceph-mon:
  expected-osd-count: 4
  monitor-count: 3

# Fix
ceph-mon:
  expected-osd-count: 2
  monitor-count: 3

Within the "Install MAAS" section of the guide it informs the user to create a 4 nodes with 3 disks. 1 disk would be occupied by root and the other 2 (/dev/sdb /dev/sdc) can be used as a ceph-osd device.

-----------------------------------
Release: on 2023-08-02 14:23:16
SHA: ebcb746a289b9a677a5c602b30bf7bdd058377d4
Source: https://opendev.org/openstack/charm-deployment-guide/src/deploy-guide/source/install-openstack.rst
URL: https://docs.openstack.org/project-deploy-guide/charm-deployment-guide/zed/install-openstack.html