fix test pub-use-extern-macros

Author: QuietMisdreavus

src/test/rustdoc/pub-use-extern-macros.rs

@@ -23,7 +23,7 @@ pub use macros::bar;
 #[doc(inline)]
 pub use macros::baz;
 
-// @has pub_use_extern_macros/macro.quux.html
+// @!has pub_use_extern_macros/macro.quux.html
 // @!has pub_use_extern_macros/index.html '//code' 'pub use macros::quux;'
 #[doc(hidden)]
 pub use macros::quux;