Rollup merge of #32558 - sanxiyn:rustdoc-self-link, r=steveklabnik

Avoid linking to itself in implementors section of trait page

Fix #32474.

src/test/rustdoc/trait-self-link.rs

@@ -0,0 +1,16 @@
+// Copyright 2016 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.
+
+// @!has trait_self_link/trait.Foo.html //a/@href ../trait_self_link/trait.Foo.html
+pub trait Foo {}
+
+pub struct Bar;
+
+impl Foo for Bar {}