Tweak docs after entire cluster Wiki-based setup run-through

[geerlingguy]

On https://www.pidramble.com/wiki/setup/network

ansible pis -i inventory -m shell -a "sleep 1s; shutdown -r now" -b -B 60 -P 0

should be:
ansible dramble -i inventory -m shell -a "sleep 1s; shutdown -r now" -b -B 60 -P 0

And on https://www.pidramble.com/wiki/setup/provision

ansible-galaxy install -r playbooks/requirements.yml --force

should be:
ansible-galaxy install -r requirements.yml --force