Rollup merge of rust-lang#34612 - frewsxcv:io-error-from_raw_os_error, r=GuillaumeGomez

Add doc examples for `io::Error::from_raw_os_error`.

None

Author: steveklabnik

src/libstd/io/error.rs

@@ -214,6 +214,30 @@ impl Error {
     }
 
     /// Creates a new instance of an `Error` from a particular OS error code.
+    ///
+    /// # Examples
+    ///
+    /// On Unix:
+    ///
+    /// ```
+    /// # if cfg!(unix) {
+    /// use std::io;
+    ///
+    /// let error = io::Error::from_raw_os_error(98);
+    /// assert_eq!(error.kind(), io::ErrorKind::AddrInUse);
+    /// # }
+    /// ```
+    ///
+    /// On Windows:
+    ///
+    /// ```
+    /// # if cfg!(windows) {
+    /// use std::io;
+    ///
+    /// let error = io::Error::from_raw_os_error(10048);
+    /// assert_eq!(error.kind(), io::ErrorKind::AddrInUse);
+    /// # }
+    /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn from_raw_os_error(code: i32) -> Error {
         Error { repr: Repr::Os(code) }