[mass55th]

"Would Strzok change his own notes after the fact?"

They weren't his notes from what I understand. It was Flynn's 302 form, that Agent Pienka filled out after the interview. At least that's what I think this article is about. And all this time Pienka has never been heard from.

[Dave Wright]

I think CivilWarBrewing has it right. The only editing in the public domain at this point was that of Peter Strzok who interviewed Michael Flynn right after the inauguration. From Fox News:

But as his legal team goes on offense in the long-running and still unresolved court proceedings, Powell alleged that FBI officials manipulated Flynn’s FBI 302 — a form used by agents to report or summarize interviews. It's not clear who may have done the alleged editing, though ex-FBI agent Peter Strzok was involved in the original interview.

[phoneman08]

This was an altered form related to one of the FISA applications. So unless there was a FISA on General Flynn, this has nothing to do with the General. That said, it would be the MOAB if there was a FISA on Flynn and this turns out to be his FISA.