temporarily fix doc test

src/lib.rs

@@ -25,8 +25,6 @@
 //!
 //! fn main() {
 //!     let mut book =  MDBook::new(Path::new("my-book"))   // Path to root
-//!                         .set_src(Path::new("src"))      // Path from root to source directory
-//!                         .set_dest(Path::new("book"))    // Path from root to output directory
 //!                         .read_config();                 // Parse book.json file for configuration
 //!
 //!     book.build().unwrap();                              // Render the book