Simplify example code.

Author: m-ou-se

src/lib.rs

@@ -37,10 +37,7 @@
 //!
 //! // This function will be called by the application
 //! fn print() -> Result<(), core::fmt::Error> {
-//!     let mut stdout = match hio::hstdout() {
-//!         Ok(fd) => fd,
-//!         Err(()) => return Err(core::fmt::Error),
-//!     };
+//!     let mut stdout = hio::hstdout().map_err(|_| core::fmt::Error)?;
 //!
 //!     let language = "Rust";
 //!     let ranking = 1;