Update Threat_Modeling_Cheat_Sheet.md

[sebob]

With reference to the discussion #1430

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[mackowski]

LGTM

[sebob]

@jmanico , @szh Do you have any comments? thoughts on the changes I propose?

[szh]

@sebob Thanks for the PR! I wonder if the new paragraphs should be before the paragraph starting "Regardless of how a DFD or comparable model is generated..."
Also, since this is a cheat sheet, I think it should be possible to combine the three new paragraphs into one short paragraph of about 3-5 sentences. Brevity is very important for the usability of the cheat sheets.