message: Fix typo in key binding manager docs
  I found a Typo error in KeyBindingManager, I have fixed that typo.
diff: # Keyboard shortcuts
  -## Using the `KeyBindingManger`
  +## Using the `KeyBindingManager`
  The `KeyBindingManager` (accessible using `getKeyBindingManager()`) is a class
  with several methods that allow you to get a `KeyBindingAction` based on a
  