Only thing I see is in Settings->General->Accessibility->Accessibility Shortcut->"
Triple-click the home button for:" and a list of items. Check that "VoiceOver" does
not show a checkmark. In fact, you can
UN-check all items, just for safety's sake.
That seems to completely turn
OFF the Accessibility Shortcut.
BTW, "Triple-click the home button for:" is in
ALL CAPS, so be careful if VoiceOver is ON when you get to that page!