Rename automatic_links to url_improvements

Author: GuillaumeGomez

core/src/lib.rs

@@ -287,7 +287,7 @@ pub mod primitive;
     unused_imports,
     unsafe_op_in_unsafe_fn
 )]
-#[cfg_attr(not(bootstrap), allow(automatic_links))]
+#[cfg_attr(not(bootstrap), allow(url_improvements))]
 // FIXME: This annotation should be moved into rust-lang/stdarch after clashing_extern_declarations is
 // merged. It currently cannot because bootstrap fails as the lint hasn't been defined yet.
 #[allow(clashing_extern_declarations)]