cron: Use day/month names instead of nos.

pages/common/crontab.md

@@ -1,6 +1,7 @@
 # crontab
 
 > Schedule cron jobs to run on a time interval for the current user.
+> Job definition format: "(min) (hour) (day_of_month) (month) (day_of_week) command_to_execute".
 
 - Edit the crontab file for the current user:
 
@@ -14,18 +15,14 @@
 
 `crontab -r`
 
-- Cron job definition format:
-
-`{{minute}} {{hour}} {{day_of_month}} {{month}} {{day_of_week}} {{command_to_execute}}`
-
 - Sample job which runs at 10:00 every day. * means any value:
 
 `0 10 * * * {{path/to/script.sh}}`
 
 - Sample job which runs every minute on the 3rd of April:
 
-`* * 3 4 * {{path/to/script.sh}}`
+`* * 3 Apr * {{path/to/script.sh}}`
 
-- Sample job which runs at 02:30 every friday:
+- Sample job which runs at 02:30 every Friday:
 
-`30 2 * * 5 {{path/to/script.sh}}`
+`30 2 * * Fri {{path/to/script.sh}}`