message: better support for mac key variants
diff: @@ -710,10 +710,10 @@ const EditYAML_ = connect(stateToProps)(
  aria-label="Shortcuts"
  bodyContent={
  <ShortcutTable>
  - <Shortcut macCtrl keyName="space">
  + <Shortcut ctrl keyName="space">
  Use Ctrl + Space to activate auto complete.
  </Shortcut>
  - <Shortcut ctrl shift keyName="o">
  + <Shortcut ctrlCmd shift keyName="o">
  Use Shift + {isMac ? 'Command' : 'Ctrl'} + O for document outlining.
  </Shortcut>
  <Shortcut hover>
  