Rollup merge of #66346 - linkmauve:try-in-docstring, r=Dylan-DPC

Replace .unwrap() with ? in std::os::unix::net

As people like to copy examples, this gives them good habits.

Author: Centril

src/libstd/sys/unix/ext/mod.rs

@@ -15,11 +15,13 @@
 //! use std::fs::File;
 //! use std::os::unix::prelude::*;
 //!
-//! fn main() {
-//!     let f = File::create("foo.txt").unwrap();
+//! fn main() -> std::io::Result<()> {
+//!     let f = File::create("foo.txt")?;
 //!     let fd = f.as_raw_fd();
 //!
 //!     // use fd with native unix bindings
+//!
+//!     Ok(())
 //! }
 //! ```