fix: double asterisk to bold fixes #2080 (#2093)

* fix: double asterisk to bold fixed

* double asterisk to bold fixed

frontend/appflowy_flutter/packages/appflowy_editor/lib/src/service/shortcut_event/built_in_shortcut_events.dart

@@ -309,7 +309,7 @@ List<ShortcutEvent> builtInShortcutEvents = [
   ),
   ShortcutEvent(
     key: 'Double asterisk to bold',
-    command: 'shift+digit 8',
+    character: '*',
     handler: doubleAsteriskToBoldHandler,
   ),
   ShortcutEvent(