Auto merge of rust-lang#86725 - JohnTitor:normalizecss-8, r=GuillaumeGomez

Upgrade normalize.css to v8.0.1

Fixes rust-lang#86629, this addresses rust-lang#82548 and rust-lang#82542 with tweaks. I expect that this changes the style *slightly* but shouldn't have any major changes.
Here's some changes I observed, I'd say they all are an improvement.

<details>
<summary>Before</summary>

![before 1](https://user-images.githubusercontent.com/25030997/123854746-0fc84800-d95a-11eb-8484-ea86dfe0ae14.png)
![before 2](https://user-images.githubusercontent.com/25030997/123854754-135bcf00-d95a-11eb-8cca-f49994629e08.png)

</details>

<details>
<summary>After</summary>

![after 1](https://user-images.githubusercontent.com/25030997/123854809-21115480-d95a-11eb-9dd2-0d3b9ca45edd.png)
![after 2](https://user-images.githubusercontent.com/25030997/123854818-22428180-d95a-11eb-83aa-fb5a698124f9.png)

</details>

r? `@jsha`

Author: bors

src/librustdoc/html/static/normalize.css

@@ -200,10 +200,31 @@ summary {
 	outline: none;
 }
 
-/* FIXME: Remove after normalize.css is either upgraded or removed (#86629) */
+/* Fix some style changes due to normalize.css 8 */
+
+td,
+th {
+	padding: 0;
+}
+
+table {
+	border-collapse: collapse;
+}
+
+button,
+input,
+optgroup,
+select,
+textarea {
+	color: inherit;
+	font: inherit;
+	margin: 0;
+}
+
+/* end tweaks for normalize.css 8 */
+
 details:not(.rustdoc-toggle) summary {
 	margin-bottom: .6em;
-	display: list-item;
 }
 
 code, pre, a.test-arrow {