Error in example code for data loaders in documentation

[StefanLiebig]

I think there is a minor error in the example code.

This

ExecutionResult.Success(people[it-1])

will not create the "null" values in the result of the query but a runtime error.
Replacing this line with

ExecutionResult.Success(people.getOrNull(it - 1))

will do.

Using Kotlin 1.6.10