Update Transport_Layer_Security_Cheat_Sheet.md

[joneskoo]

• Remove Extended Validation section.

Resolves #1413.

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This PR covers issue #1413 .

[kwwall]

@jmanico - Let's hold off on merging this until Mark Gamache weighs in on this. I suspect he will recommend removing this paragraph too, but I asked him to look at it to see if he could suggest an alternative or an explanation of why its being removed.