Auto merge of #99066 - est31:remove_box_librustdoc, r=jsha

Remove most box syntax from librustdoc

This is the second attempt after the librustdoc specific changes have been reverted from #87781 in #89134, due to a minor, but exant regression caused by the changes. ~~There have been some changes to librustdoc in the past and maybe thanks to them there is no regression any more. If there is still a regression, one can investigate further and maybe find ways to fix the regressions. Thus, i request a perf run.~~ Edit: turns out there is still a regression, but it's caused only by a subset of the changes. So I've changed this PR to only contains the changes that don't cause any performance regressions, keeping the regression causing changes for a later PR.

src/librustdoc/core.rs

@@ -288,7 +288,7 @@ pub(crate) fn create_config(
         diagnostic_output: DiagnosticOutput::Default,
         lint_caps,
         parse_sess_created: None,
-        register_lints: Some(box crate::lint::register_lints),
+        register_lints: Some(Box::new(crate::lint::register_lints)),
         override_queries: Some(|_sess, providers, _external_providers| {
             // Most lints will require typechecking, so just don't run them.
             providers.lint_mod = |_, _| {};