message: fix spell things I forced into master.
diff: @@ -35,7 +35,7 @@ We'll change the TermControl class to derive from the
  * Otherwise, it might be possible that we could just remove that fake control
  entirely.
  * We'll remove the `GetControl` method from the `TermControl`, as the
  - `TermControl` itslef will now be used as the control.
  + `TermControl` itself will now be used as the control.
  We'll change the Pane class to accept a `Windows.UI.Xaml.Controls.Control`
  instead of a `TermControl`.
  @@ -76,8 +76,8 @@ is a bigger discussion than the feature at hand, however.
  ### Performance, Power, and Efficiency
  +decide to host a WebView in a pane, then it surely could impact these measures.
  I don't believe this will have a noticable impact _on its own_. Should the user
  -decide to host a WebView in a pane, then it surely could impact these measuress.
  However, I leave that discussion to the implementation of the actual alternative
  pane content itself.
  