docs: #385

Author: hunterliu1003

docs/content/3.api/2.composables/1.use-modal.md

@@ -44,6 +44,7 @@ const { open, close, destroy, options, patchOptions } = useModal({
     clickToClose: true,
     escToClose: true,
     // Bind events to the modal component (VueFinalModal in this case).
+    // Any custom events can be listened for when prefixed with "on", e.g. "onEventName".
     onBeforeOpen() { /* on before open */ },
     onOpened() { /* on opened */ },
     onBeforeClose() { /* on before close */ },