Improve documentation: example code to configure SMTP (#4555)
Improve documentation: example code to configure SMTP (#4555)

* add example code

* just a changed line break

* fix

* Fix

Co-authored-by: Alexandre Alapetite <b30f4169e054ee7b8c243480bcfcef62416f3b08@alapetite.fr>
Alkarex/FreshRSS,FreshRSS/FreshRSS,aledeg/FreshRSS,Alkarex/FreshRSS,FreshRSS/FreshRSS,aledeg/FreshRSS,FreshRSS/FreshRSS,aledeg/FreshRSS,Alkarex/FreshRSS,Alkarex/FreshRSS,FreshRSS/FreshRSS,aledeg/FreshRSS