Rollup merge of rust-lang#87154 - GuillaumeGomez:rev-attr-a, r=JohnTitor

Fix misuse of rev attribute on <a> tag

The `rev` attribute is supposed to talk about "ownership" as far as I could found out. This attribute seems not very well defined in the HTML spec and its usage in rustdoc is suboptimal.

It was found out in rust-lang#87149.

r? `@JohnTitor`

src/librustdoc/html/markdown.rs

@@ -621,8 +621,7 @@ impl<'a, I: Iterator<Item = SpannedEvent<'a>>> Iterator for Footnotes<'a, I> {
                                 is_paragraph = true;
                             }
                             html::push_html(&mut ret, content.into_iter());
-                            write!(ret, "&nbsp;<a href=\"#fnref{}\" rev=\"footnote\">↩</a>", id)
-                                .unwrap();
+                            write!(ret, "&nbsp;<a href=\"#fnref{}\">↩</a>", id).unwrap();
                             if is_paragraph {
                                 ret.push_str("</p>");
                             }