Problem/Motivation
Follow up to #3198608: trackLastImported YAML key to enable tracking the last import date of a row is undocumented and confusing. and also much needed.
Document the available definition properties of a migration defined in a yml.
Steps to reproduce
Go to class Migration and see no list or explanation of the properties.
Proposed resolution
Write the documentation
Remaining tasks
Patch
Review
Commit
User interface changes
N/A
API changes
N/A
Data model changes
N/A
Release notes snippet
N/A