Fix ?Sized where bound not being displayed at the correct place

src/test/rustdoc/where-sized.rs

@@ -0,0 +1,16 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![crate_name = "foo"]
+
+// @has foo/fn.foo.html
+// @has - '//*[@class="rust fn"]' 'pub fn foo<X, Y: ?Sized>(_: &X)'
+// @has - '//*[@class="rust fn"]' 'where X: ?Sized,'
+pub fn foo<X, Y: ?Sized>(_: &X) where X: ?Sized {}