docs(shortcuts): add example usage for arrow keys (#859)

docs/content/1.getting-started/4.shortcuts.md

@@ -62,6 +62,11 @@ Examples of keys:
 - `shift_e`: will trigger by hitting `Shift` and `E` at the same time on MacOS, Windows and Linux
 - `?`: will trigger by hitting `?` on some keyboard layouts, or for example `Shift` and `/`, which results in `?` on US Mac keyboards
 - `g-d`: will trigger by hitting `g` then `d` with a maximum delay of 800ms by default
+- `arrowleft`: will trigger by hitting `←` (also: `arrowright`, `arrowup`, `arrowdown`)
+
+::callout{icon="i-heroicons-light-bulb"}
+For a complete list of available shortcut keys, refer to the [`KeyboardEvent`](https://developer.mozilla.org/en-US/docs/Web/API/UI_Events/Keyboard_event_key_values) API docs. Note the `KeyboardEvent.key` has to be written in lowercase.
+::
 
 ### `usingInput`