Stop saying that const functions cannot use 'extern'
@@ -216,8 +216,7 @@ Functions qualified with the `const` keyword are [const functions], as are
[tuple struct] and [tuple variant] constructors. _Const functions_ can be
called from within [const contexts].
-Const functions are not allowed to be [async](#async-functions), and cannot
-use the [`extern` function qualifier](#extern-function-qualifier).
+Const functions are not allowed to be [async](#async-functions).
## Async functions
