Rollup merge of rust-lang#107535 - dcompoze:tcp-doc-unwrap, r=cuviper

Replace unwrap with ? in TcpListener doc

The example in TcpListener doc returns `std::io::Result<()>` but the code inside the function uses `unwrap()` instead of `?`.

library/std/src/net/tcp.rs

@@ -829,7 +829,7 @@ impl TcpListener {
     /// }
     ///
     /// fn main() -> std::io::Result<()> {
-    ///     let listener = TcpListener::bind("127.0.0.1:80").unwrap();
+    ///     let listener = TcpListener::bind("127.0.0.1:80")?;
     ///
     ///     for stream in listener.incoming() {
     ///         match stream {