fix @!has conditions in pub-use-extern-macros test

Author: QuietMisdreavus

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

@@ -15,15 +15,15 @@
 extern crate macros;
 
 // @has pub_use_extern_macros/macro.bar.html
-// @!has pub_use_extern_macros/index.html 'pub use macros::bar;'
+// @!has pub_use_extern_macros/index.html '//code' 'pub use macros::bar;'
 pub use macros::bar;
 
 // @has pub_use_extern_macros/macro.baz.html
-// @!has pub_use_extern_macros/index.html 'pub use macros::baz;'
+// @!has pub_use_extern_macros/index.html '//code' 'pub use macros::baz;'
 #[doc(inline)]
 pub use macros::baz;
 
 // @has pub_use_extern_macros/macro.quux.html
-// @!has pub_use_extern_macros/index.html 'pub use macros::quux;'
+// @!has pub_use_extern_macros/index.html '//code' 'pub use macros::quux;'
 #[doc(hidden)]
 pub use macros::quux;