Merge #2612

2612: Remove duplicated 'actionstart = ' in fail2ban conf. r=mergify[bot] a=lucassith

In fail2ban example configuration for ipset `option #2`, there is a duplicated string which makes the ipset and fail2ban fail to create the set. 
Fail2ban will never ban any ip due to this error.

## What type of PR?

documentation

Co-authored-by: Łukasz Sitarski <Lucassith@gmail.com>

docs/faq.rst

@@ -665,7 +665,7 @@ Using iptables with ipset might reduce the system load in such attacks significa
 
   [Definition]
 
-  actionstart = actionstart = ipset --create f2b-bad-auth iphash
+  actionstart = ipset --create f2b-bad-auth iphash
                 iptables -I DOCKER-USER -m set --match-set f2b-bad-auth src -j DROP
 
   actionstop = iptables -D DOCKER-USER -m set --match-set f2b-bad-auth src -j DROP