fix typos

src/unistd.rs

@@ -2778,7 +2778,7 @@ mod tests {
         thread::spawn(move || {
             // set filesystem UID
             let _ = setfsuid(nobody.uid);
-            // try to open the temporaty file should fail with EACCES
+            // trying to open the temporary file should fail with EACCES
             let res = fs::File::open(&temp_path);
             assert!(res.is_err());
             assert_eq!(res.err().unwrap().kind(), io::ErrorKind::PermissionDenied);