rewording so that it is a little clearer (openemr#4554)

Documentation/README-Log-Backup.txt

@@ -4,10 +4,13 @@
 Create an entry in the CRON tab for taking weekly backup of the OpenEMR Log table
 
 1) This Cron job will take weekly backup on Every Sunday, 0th hour,0th min
-2) Arguments are mandatory. For successful execution of the script, webserver_root & backup_log_dir value must match with the value in the /interface/globals.php file.
+2) Arguments are mandatory. For successful execution of the script,
+ a) you must know your webserver_root folder i.e. /var/www/openemr
+ b) backup_log_dir value must match with the value in the Globals setting.
 
 Use the following in the crontab:
 -------------------------------
 0 0 * * 0 php [webserver_root]/interface/main/backuplog.php webserver_root backup_log_dir
 
 **** Eg. 0 0 * * 0 php /home/openemr/interface/main/backuplog.php /home/openemr /opt
+