Adam Johnson c740a994fa [3.0.x] Improved docs on migration reversibility.
- Clarify reversibility for RunSQL and RunPython operations.
- Add example for migrate with irreversible migration.

Co-authored-by: Carlton Gibson <carlton.gibson@noumenal.es>
Backport of b15b3706fec8ef59577ac47118ee0c62132a03a6 from master
2020-03-25 14:39:17 +01:00
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