fix: bottomUpTraverse() skips ListBlock items

This was a pre-existing bug that affected all content inside list items
(not just our new Markdown lists, but also existing `@li` ones).

Author: gennaroprota

include/mrdocs/Metadata/DocComment.hpp

@@ -255,6 +255,18 @@ traverseImpl(NodeTy& N, F&& func)
     {
         traverseImpl<bottomUp>(N.exception, func);
     }
+
+    if constexpr (std::same_as<NodeTy, doc::ListBlock>)
+    {
+        for (auto& item: N.items)
+        {
+            for (auto& block: item.blocks)
+            {
+                traverseImpl<bottomUp>(block, func);
+            }
+        }
+    }
+
     if constexpr (bottomUp && std::invocable<F, NodeTy&>)
     {
         func(N);