[docs] Configuration: some stylistic improvements (#1693)
[docs] Configuration: some stylistic improvements (#1693)

The main purpose is to fix the `imapcted` typo that was exposed by https://github.com/FreshRSS/FreshRSS/issues/1259#issuecomment-345034276
aledeg/FreshRSS,romibi/FreshRSS,FreshRSS/FreshRSS,FreshRSS/FreshRSS,romibi/FreshRSS,romibi/FreshRSS,marienfressinaud/FreshRSS,marienfressinaud/FreshRSS,FreshRSS/FreshRSS,marienfressinaud/FreshRSS,aledeg/FreshRSS,aledeg/FreshRSS,romibi/FreshRSS,marienfressinaud/FreshRSS,Alkarex/FreshRSS,Alkarex/FreshRSS,Alkarex/FreshRSS,Alkarex/FreshRSS,FreshRSS/FreshRSS,aledeg/FreshRSS