Added a mention of nix-repl in Nix doc
Added a mention of nix-repl in Nix doc

AndreasPK/stack,martin-kolinek/stack,sjakobi/stack,deech/stack,AndrewRademacher/stack,deech/stack,mrkkrp/stack,narrative/stack,mrkkrp/stack,MichielDerhaeg/stack,Fuuzetsu/stack,Fuuzetsu/stack,anton-dessiatov/stack,harendra-kumar/stack,Blaisorblade/stack,phadej/stack,Heather/stack,AndreasPK/stack,juhp/stack,AndrewRademacher/stack,juhp/stack,martin-kolinek/stack,narrative/stack,achernyak/stack,luigy/stack,Heather/stack,MichielDerhaeg/stack,luigy/stack,phadej/stack,anton-dessiatov/stack,harendra-kumar/stack,Blaisorblade/stack,sjakobi/stack,achernyak/stack