Improve solver/init help messages (mention hpack)
Improve solver/init help messages (mention hpack)

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