Use correct path in panic!() comment.

Author: m-ou-se

library/core/src/macros/mod.rs

@@ -27,7 +27,7 @@ macro_rules! panic {
 #[stable(feature = "core", since = "1.6.0")]
 #[rustc_diagnostic_item = "core_panic_macro"]
 macro_rules! panic {
-    // Expands to either `$crate::panic_2015` or `$crate::panic_2021`
+    // Expands to either `$crate::panic::panic_2015` or `$crate::panic::panic_2021`
     // depending on the edition of the caller.
     ($($arg:tt)*) => {
         /* compiler built-in */

library/std/src/macros.rs

@@ -26,7 +26,7 @@ macro_rules! panic {
 #[allow_internal_unstable(edition_panic)]
 #[cfg_attr(not(test), rustc_diagnostic_item = "std_panic_macro")]
 macro_rules! panic {
-    // Expands to either `$crate::panic_2015` or `$crate::panic_2021`
+    // Expands to either `$crate::panic::panic_2015` or `$crate::panic::panic_2021`
     // depending on the edition of the caller.
     ($($arg:tt)*) => {
         /* compiler built-in */