rustdoc: Fix mismatched capitalization in sidebar

Previously, the main content used "Aliased Type", while the sidebar said
"Aliased type". Now, they both say "Aliased Type", which is the more common
capitalization in Rustdoc.

See the following link for an example.
https://doc.rust-lang.org/1.83.0/std/io/type.Result.html

Author: camelid

src/librustdoc/html/render/sidebar.rs

@@ -357,7 +357,7 @@ fn sidebar_type_alias<'a>(
     deref_id_map: &'a DefIdMap<String>,
 ) {
     if let Some(inner_type) = &t.inner_type {
-        items.push(LinkBlock::forced(Link::new("aliased-type", "Aliased type"), "type"));
+        items.push(LinkBlock::forced(Link::new("aliased-type", "Aliased Type"), "type"));
         match inner_type {
             clean::TypeAliasInnerType::Enum { variants, is_non_exhaustive: _ } => {
                 let mut variants = variants