Try to update parser doc

Author: Kangaxx-0

crates/parser/src/event.rs

@@ -2,11 +2,6 @@
 //! It is intended to be completely decoupled from the
 //! parser, so as to allow to evolve the tree representation
 //! and the parser algorithm independently.
-//!
-//! The `TreeSink` trait is the bridge between the parser and the
-//! tree builder: the parser produces a stream of events like
-//! `start node`, `finish node`, and `FileBuilder` converts
-//! this stream to a real tree.
 use std::mem;
 
 use crate::{