Rollup merge of rust-lang#73464 - qy3u:fs-document-format-correction, r=jonas-schievink

Document format correction

Minor amendments to the document.

r? @steveklabnik

Author: RalfJung

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

@@ -242,7 +242,8 @@ pub trait PermissionsExt {
     ///     let permissions = metadata.permissions();
     ///
     ///     println!("permissions: {:o}", permissions.mode());
-    ///     Ok(()) }
+    ///     Ok(())
+    /// }
     /// ```
     #[stable(feature = "fs_ext", since = "1.1.0")]
     fn mode(&self) -> u32;
@@ -262,7 +263,8 @@ pub trait PermissionsExt {
     ///
     ///     permissions.set_mode(0o644); // Read/write for owner and read for others.
     ///     assert_eq!(permissions.mode(), 0o644);
-    ///     Ok(()) }
+    ///     Ok(())
+    /// }
     /// ```
     #[stable(feature = "fs_ext", since = "1.1.0")]
     fn set_mode(&mut self, mode: u32);