Rollup merge of #68224 - GuillaumeGomez:prevent-urls-in-headings, r=ollie27

Prevent urls in headings

Fixes #68215.

cc @pietroalbini @ollie27

r? @kinnison

src/test/rustdoc/remove-url-from-headings.rs

@@ -0,0 +1,17 @@
+#![crate_name = "foo"]
+
+// @has foo/fn.foo.html
+// !@has - '//a[@href="http://a.a"]'
+// @has - '//a[@href="#implementing-stuff-somewhere"]' 'Implementing stuff somewhere'
+// @has - '//a[@href="#another-one-urg"]' 'Another one urg'
+
+/// fooo
+///
+/// # Implementing [stuff](http://a.a "title") somewhere
+///
+/// hello
+///
+/// # Another [one][two] urg
+///
+/// [two]: http://a.a
+pub fn foo() {}