Fix doc on select example

[Odonno]

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What is the motivation?

I noticed something wrong on the example doc of the select function:

// You can skip an unnecessary option if you know the record already exists
let person: Option<Person> = db.select(("person", "h5wxrf2ewk8xjxosxtyc")).await?;

It says we can skip the Option<T> to use just T but the code below the comment does not reflect it.

What does this change do?

Fix the example documentation

What is your testing strategy?

N/A

Is this related to any issues?

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Have you read the Contributing Guidelines?

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