Update trait toggle test

Author: GuillaumeGomez

src/test/rustdoc/toggle-trait-fn.rs

@@ -1,7 +1,11 @@
 #![crate_name = "foo"]
 
 // @has foo/trait.Foo.html
-// @has - '//details[@class="rustdoc-toggle"]//code' 'bar'
+// @!has - '//details[@class="rustdoc-toggle"]//code' 'bar'
+// @has - '//code' 'bar'
+// @has - '//details[@class="rustdoc-toggle"]//code' 'foo'
 pub trait Foo {
     fn bar() -> ();
+    /// hello
+    fn foo();
 }