Fix ecs documentation

libs/ecs/include/psemek/ecs/container.hpp

@@ -109,7 +109,7 @@ namespace psemek::ecs
 		 *  The new entity is considered alive immediately after this call.
 		 *
 		 *  @param entity A handle to the entity to clone
-		 *  @return A handle to cloned entity if the original entity was cloneable, and std::nullopt otherwise
+		 *  @return A handle to the cloned entity
 		 *  @pre The entity was previously obtained by a `create()` call and is `alive()`
 		 *  @throw entity_not_cloneable if the entity is not cloneable
 		 */