update comment

library/std/src/rt.rs

@@ -95,10 +95,7 @@ unsafe fn init(argc: isize, argv: *const *const u8, sigpipe: u8) {
     unsafe {
         sys::init(argc, argv, sigpipe);
 
-        // Next, set up the current Thread with the guard information we just
-        // created. Note that this isn't necessary in general for new threads,
-        // but we just do this to name the main thread and to give it correct
-        // info about the stack bounds.
+        // Set up the current thread to give it the right name.
         let thread = Thread::new(Some(rtunwrap!(Ok, CString::new("main"))));
         thread::set_current(thread);
     }