Update index.md

Add information for Windows hosts when adding custom cron jobs

DOCUMENTATION/content/documentation/index.md

@@ -1058,6 +1058,8 @@ You can add your cron jobs to `workspace/crontab/root` after the `php artisan` l
 
 Make sure you [change the timezone](#Change-the-timezone) if you don't want to use the default (UTC).
 
+If you are on Windows, be sure that the line endings for this file are LF only, or the cron jobs will silently fail.
+