remove reason = "unstable" from #[unstable(...)]

library/std/src/os/unix/net/mod.rs

@@ -47,5 +47,5 @@
     target_vendor = "apple",
     target_os = "cygwin",
 ))]
-#[unstable(feature = "peer_credentials_unix_socket", issue = "42839", reason = "unstable")]
+#[unstable(feature = "peer_credentials_unix_socket", issue = "42839")]
 pub use self::ucred::*;

library/std/src/os/unix/net/stream.rs

@@ -251,7 +251,7 @@ pub fn peer_addr(&self) -> io::Result<SocketAddr> {
     ///     Ok(())
     /// }
     /// ```
-    #[unstable(feature = "peer_credentials_unix_socket", issue = "42839", reason = "unstable")]
+    #[unstable(feature = "peer_credentials_unix_socket", issue = "42839")]
     #[cfg(any(
         target_os = "android",
         target_os = "linux",

library/std/src/os/unix/net/ucred.rs

@@ -7,7 +7,7 @@
 use libc::{gid_t, pid_t, uid_t};
 
 /// Credentials for a UNIX process for credentials passing.
-#[unstable(feature = "peer_credentials_unix_socket", issue = "42839", reason = "unstable")]
+#[unstable(feature = "peer_credentials_unix_socket", issue = "42839")]
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 pub struct UCred {
     /// The UID part of the peer credential. This is the effective UID of the process at the domain