Attampt to index refCounts with std::string when std::type_index is expected

Hi,

In the tutorial on Resource management (specifically here: https://docs.vulkan.org/tutorial/latest/Building_a_Simple_Engine/Engine_Architecture/04_resource_management.html#_resource_manager_storage_architecture_and_type_safety), an associative array is created to stored resources' reference counts based on a specific type. But I have a problem with the following section (https://docs.vulkan.org/tutorial/latest/Building_a_Simple_Engine/Engine_Architecture/04_resource_management.html#_resource_manager_resource_loading_and_caching_logic) in the Load method. In my understanding, when we try to increment/initialize the reference counter for a given resource, it does this :

```cpp
refCounts[resourceId]++
```

or this :

```cpp
refCounts[resourceId] = 1;
```

but based on the definition of the refCounts associative array, I would have thought it should have done something more like this :

```cpp
auto& typeReferenceCounters = refCounts[std::type_index(typeid(T))];
typeReferenceCounters[resourceId].refCount++; // or typeReferenceCounters[resourceId].refCount = 1 for the other case
```

Please tell me if I am wrong, I would be glad to learn from my mistakes.

Best regards,

ajvp