Be more specific about the implications of the panic!

dns2utf8 · dns2utf8 · commit 9e001ce86522 · 2017-07-05T23:44:24.000+02:00
diff --git a/src/libstd/macros.rs b/src/libstd/macros.rs
@@ -26,7 +26,7 @@
 ///
 /// # Current implementation
 ///
-/// If the main thread panics it will return with code `101`.
+/// If the main thread panics it will terminate all your threads and end your program with code `101`.
 ///
 /// # Examples
 ///
