Update 03_Main_view.md

Document all the parameters for "feed actualize".

the new parameter "maxfeeds" from Pull Request #2388 is already considered.

docs/en/users/03_Main_view.md

@@ -30,6 +30,23 @@ Here is an example to trigger article update every hour.
 0 * * * * php /path/to/FreshRSS/app/actualize_script.php > /tmp/FreshRSS.log 2>&1
 ```
 
+Special parameters to configure the script - all parameters can be combined:
+
+- Parameter "force"  
+https://freshrss.example.net/i/?c=feed&a=actualize&force=1  
+If force is set to 1 all feeds will be refreshed at once.
+
+- Parameter "ajax"  
+https://freshrss.example.net/i/?c=feed&a=actualize&ajax=1  
+Only a status site is returned and not a complete website. Example: "OK"
+
+- Parameter "maxfeeds"  
+https://freshrss.example.net/i/?c=feed&a=actualize&maxfeeds=30  
+If maxfeeds is set the confgured amount of feeds is refreshed at once. The default setting is "10".
+
+- Parameter "token"  
+https://freshrss.example.net/i/?c=feed&a=actualize&token=542345872345734  
+Security parameter to prevent unauthorized refreshs. For detailed Documentation see "Form authentication".
 
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