Firstly thank you. Please add a restart command in Documentation

[pi-cristea]

Firstly thank you. Second: Please add a restart command in Documentation. I used on Ubuntu 18.04 sudo systemctl restart ccpd.service

it's useful in case of printing errors like "ccp sending data error exit 1".

I got this error:

• while using all the paper in the printer tray
• close the document before it was finished printing