Fix doc

src/highlight.rs

+//! Syntax highlighting
+
 use config::CompletionType;
-///! Syntax highlighting
 use std::borrow::Cow::{self, Borrowed};
 
 /// Syntax highlighter with [ansi color](https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_(Select_Graphic_Rendition)_parameters).