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>
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bors[bot] 2 years ago committed by GitHub
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@ -665,7 +665,7 @@ Using iptables with ipset might reduce the system load in such attacks significa
[Definition] [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 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 actionstop = iptables -D DOCKER-USER -m set --match-set f2b-bad-auth src -j DROP

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