Update some inaccuracies in markdown files

style.md

@@ -317,12 +317,12 @@ Arena(Arena &&source) noexcept;
 - **Friend-based factories** for access control when constructor should be private
 - **Ownership guidelines:**
   - **unique_ptr** for exclusive ownership (most common case)
-  - **shared_ptr** only when multiple owners need concurrent access to same object
+  - **Ref** only when object logically has multiple owners (`Ref` is our custom std::shared_ptr variant)
   - **Factory methods return appropriate smart pointer type** based on ownership needs
 
 ```cpp
 // Shared ownership - multiple components need concurrent access
-auto server = Server::create(config, handler);  // Returns shared_ptr
+auto server = Server::create(config, handler);  // Returns Ref<Server>
 
 // Exclusive ownership - single owner, transfer via move
 auto connection = Connection::createForServer(addr, fd, connection_id, handler, server_ref);