Fix - documentation fix
Correct references to user ids to group ids.
@@ -2138,9 +2138,9 @@ mod setres {
/// Sets the real, effective, and saved gid.
/// ([see setresuid(2)](http://man7.org/linux/man-pages/man2/setresuid.2.html))
///
- /// * `rgid`: real user id
- /// * `egid`: effective user id
- /// * `sgid`: saved user id
+ /// * `rgid`: real group id
+ /// * `egid`: effective group id
+ /// * `sgid`: saved group id
/// * returns: Ok or libc error code.
///
/// Err is returned if the user doesn't have permission to set this GID.
