Add FAQ entry for reach of --ghc-options
Add FAQ entry for reach of --ghc-options

Closes #827.

[ci skip]

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