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Issue description

Missing content in the troubleshooting playbooks. Specifically the -step and the start-at-task is missing. The most important one here is the -start-at-task ** as it allows developing an Ansible playbook in an iterative fashion. Many students in the DO374 were unaware this command existed for troubleshooting a playbook. I initially thought some of the instructors missed it, but it is no longer in the book.

Steps to reproduce:

N/A

Workaround:

Teach it anyway because this is a critical component to understanding Ansible playbook development and troubleshooting

Expected result:

Content is in the book