Fix weeklyOn() example's explanation

`weeklyOn(1, '8:00')` will be triggered on Mondays, but not Tuesdays.

Author: andonovn

scheduling.md

@@ -115,7 +115,7 @@ Method  | Description
 `->dailyAt('13:00');`  |  Run the task every day at 13:00
 `->twiceDaily(1, 13);`  |  Run the task daily at 1:00 & 13:00
 `->weekly();`  |  Run the task every week
-`->weeklyOn(1, '8:00');`  |  Run the task every week on Tuesday at 8:00
+`->weeklyOn(1, '8:00');`  |  Run the task every week on Monday at 8:00
 `->monthly();`  |  Run the task every month
 `->monthlyOn(4, '15:00');`  |  Run the task every month on the 4th at 15:00
 `->quarterly();` |  Run the task every quarter