Rollup merge of rust-lang#92673 - GuillaumeGomez:remove-all-items-toggle, r=jsha

Remove useless collapse toggle on "all items" page

When clicking on this toggle, nothing happens because there is nothing to collapse. Instead of keeping it around, let's just remove it.

Before:

![Screenshot from 2022-01-08 16-02-38](https://user-images.githubusercontent.com/3050060/148649149-821a1e77-8c34-4975-b50a-984ca8865518.png)

After:

![Screenshot from 2022-01-08 16-02-32](https://user-images.githubusercontent.com/3050060/148649154-b5912a97-9229-46bd-be3c-df3c3fa3ac8f.png)

r? `@jsha`

Author: matthiaskrgr

src/librustdoc/html/render/mod.rs

@@ -312,14 +312,6 @@ impl AllTypes {
         f.write_str(
             "<h1 class=\"fqn\">\
                  <span class=\"in-band\">List of all items</span>\
-                 <span class=\"out-of-band\">\
-                     <span id=\"render-detail\">\
-                         <a id=\"toggle-all-docs\" href=\"javascript:void(0)\" \
-                            title=\"collapse all docs\">\
-                             [<span class=\"inner\">&#x2212;</span>]\
-                         </a>\
-                     </span>
-                 </span>
              </h1>",
         );
         // Note: print_entries does not escape the title, because we know the current set of titles