Add explanation to "cloak" field

What is the exact difference between these? Does `CloakedDetected` mean seeing the slight tremor when an invisible unit moves?

```protobuf
enum CloakState {
Cloaked = 1;
CloakedDetected = 2;
NotCloaked = 3;
}
```

Locate the protobuf definition containing the CloakState enum shown in the issue and read nearby protocol documentation or usage. Determine how Cloaked differs from CloakedDetected, then document that distinction beside the enum; done means the meaning of all three states is clear without relying on guesswork.

Written by the indexing model from the issue text.