Fix Dell OS10 Ansible-related information

[ipspace]

• It looks like OS10 requires dellemc.os10 Ansible collection to work. Added that information to the box-building instructions
• The 'dellos10.yml' configuration deployment task failed for me. It looks like the newer versions of the dellemc.os10 Ansible collection expect a filename, not the actual commands, as the parameter to dellemc.os10.os10_config.