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Update generic-constraints.md

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added extra . for clarity and consistency
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@ -23,7 +23,7 @@ local function callbackProperty<T>( object: T, key: keyof<T>, callback: (propert
It is impossible to tell whether or not `key` is the same variable being used to index `T` in the callback, and thus Luau infers the type of `property` to be `number | string`.
```luau
local function callbackProperty<T>( object: T, key: keyof<T>, callback: (property: index<T, K>) -> () )
...
....
```
This does not work in Luau.
> Ideally, this behaviour should work out of the box, but, could be solved with bounded polymorphism.