Auto merge of #48755 - GuillaumeGomez:rustdoc-fixes, r=QuietMisdreavus

Multiple rustdoc fixes

Fixes #48733.

r? @QuietMisdreavus

src/test/rustdoc/fn-sidebar.rs

@@ -0,0 +1,19 @@
+// 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.bar.html
+// @has - '//*[@class="sidebar-elems"]' ''
+pub fn bar() {}
+
+// @has foo/constant.BAR.html
+// @has - '//*[@class="sidebar-elems"]' ''
+pub const BAR: u32 = 0;