message: Fix typo in - Quake Mode.md
  Quiting -> Quitting
diff: @@ -714,7 +714,7 @@ Docs regarding hiding a window from the taskbar:
  ### Footnotes
  <a name="footnote-1"><a>[1]: Quitting the terminal is different than closing the
  -windows one-by-one. Quiting implies an atomic action, for closing all the
  +windows one-by-one. Quitting implies an atomic action, for closing all the
  windows. Once [#766] lands, this will give us a chance to persist the state of
  _all_ open windows. This will allow us to re-open with all the user's windows,
  not just the one that happened to be closed last.
  