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Update docs/metatable-type-functions.md

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Co-authored-by: ariel <aweiss@hey.com>
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docs/metatable-type-functions.md
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@ -70,8 +70,9 @@ type metatable = {
type MetatableType = getmetatable<setmetatable<{}, metatable>>
```
If the type passed into the type function doesn't have a metatable and it *could* have a metatable (so primitives, singletons, classes, and tables), then it will return nil.
If the type passed in is an intersection or union, then it will return an intersection or union respectively.
If the type passed in does not support metatables in the type system (i.e. at the time of writing, is not any of a primitive, a singleton, a class, a table, or a union or intersection thereof), it should error when passed to `getmetatable`.
If the type passed in is an intersection or union of things that support metatables, then it will return an intersection or union of those metatables respectively.
If no metatable is present, but the type system supports metatables for that type, it should return the `nil` type indicating that there is no metatable present.
## Drawbacks