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The purpose of this document is to […]. This document will [explain, demonstrate, etc] the process, along with any caveats, important notes, incidental differences and so on.
Anything that should be read, done, etc before proceeding with this document
Any notes that should be kept in mind before beginning.
Actual documentation, procedure, etc.
Any notes that should be added at the end of the documentation; things to check, things to keep in mind, etc.