Beginners Guide: References Old Checklist

[tshomas]

Beginners guide was written during the times of the old before takeoff checklist that was broken into two parts, above and below the line, the current checklist is the new airbus format where they've been separated into two checklists.

Possibly other references to the old checklist throughout the doc but was raised as an issue by a user in the support channels mainly focused on the taxi and before takeoff parts.