message: Add missing binding + remove invalid note
  HOME and END are going back to the start/end of the same line, i.e. they
  are different to the other bindings.
diff: @@ -68,7 +68,6 @@ const messageComposerBindings = (): KeyBinding<MessageComposerAction>[] => {
  ctrlOrCmd: true,
  },
  },
  - // Note: the following two bindings also work with just HOME and END, add them here?
  {
  action: MessageComposerAction.MoveCursorToStart,
  keyCombo: {
  @@ -165,6 +164,14 @@ const autocompleteBindings = (): KeyBinding<AutocompleteAction>[] => {
  shiftKey: true,
  },
  },
  + {
  + action: AutocompleteAction.ApplySelection,
  + keyCombo: {
  + key: Key.TAB,
  + ctrlKey: true,
  + shiftKey: true,
  + },
  + },
  {
  action: AutocompleteAction.Cancel,
  keyCombo: {
  