Rollup merge of rust-lang#43760 - ollie27:rustdoc_search_css, r=Guill…

…aumeGomez

rustdoc: Fix broken CSS in search results

The layout is currently broken for struct/union fields and enum variants
in the search results when searching from a struct, union or enum page.

Some examples:
https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html?search=start
https://doc.rust-lang.org/nightly/std/option/enum.Option.html?search=some

 rust-lang#34477 was an incomplete fix

src/librustdoc/html/static/rustdoc.css

@@ -705,7 +705,7 @@ span.since {
 	margin-bottom: 25px;
 }
 
-.enum .variant, .struct .structfield, .union .structfield {
+#main > .variant, #main > .structfield {
 	display: block;
 }