Update OverworldEditor documentation and others

src/app/zelda3/common.h

@@ -4,11 +4,15 @@
 namespace yaze {
 namespace app {
 /**
- * @namespace zelda3
+ * @namespace yaze::app::zelda3
  * @brief Zelda 3 specific classes and functions.
  */
 namespace zelda3 {
 
+/**
+ * @class OverworldEntity
+ * @brief Base class for all overworld entities.
+ */
 class OverworldEntity {
  public:
   enum EntityType {