fix code example

Author: erwanMarmelab

docs/Calendar.md

@@ -403,6 +403,8 @@ You will need to:
 
 Here is an example:
 
+{% raw %}
+
 ```tsx
 import { DatesSetArg } from '@fullcalendar/core';
 import { add, set, sub } from 'date-fns';
@@ -466,6 +468,8 @@ const EventListEventFormat = () => {
 };
 ```
 
+{% endraw %}
+
 ## `<Calendar>`
 
 A wrapper around full-calendar's `<FullCalendar>` component, using react-admin's `useListContext` hook to read data, and linking to the edit and create views of the current resource. Must be used inside a `<ListContext>`.