remove link to FAQ
//! If you are upgrading to nom 5.0, please read the
//! [migration document](https://github.com/Geal/nom/blob/master/doc/upgrading_to_nom_5.md).
//!
-//! See also the [FAQ](https://github.com/Geal/nom/blob/master/doc/FAQ.md).
-//!
//! ## Parser combinators
//!
//! Parser combinators are an approach to parsers that is very different from
