Finishing clone3 clean up

Author: Askar Safin

library/std/src/os/linux/process.rs

@@ -149,8 +149,7 @@ pub trait CommandExt: Sealed {
     /// The pidfd can be retrieved from the child with [`pidfd`] or [`take_pidfd`].
     ///
     /// A pidfd will only be created if it is possible to do so
-    /// in a guaranteed race-free manner (e.g. if the `clone3` system call
-    /// is supported). Otherwise, [`pidfd`] will return an error.
+    /// in a guaranteed race-free manner. Otherwise, [`pidfd`] will return an error.
     ///
     /// If a pidfd has been successfully created and not been taken from the `Child`
     /// then calls to `kill()`, `wait()` and `try_wait()` will use the pidfd

library/std/src/sys/pal/unix/process/process_unix.rs

@@ -147,8 +147,7 @@ impl Command {
         #[cfg(not(target_os = "linux"))]
         let pidfd = -1;
 
-        // Safety: We obtained the pidfd from calling `clone3` with
-        // `CLONE_PIDFD` so it's valid an otherwise unowned.
+        // Safety: We obtained the pidfd (on Linux) using SOCK_SEQPACKET, so it's valid.
         let mut p = unsafe { Process::new(pid, pidfd) };
         let mut bytes = [0; 8];