docs: update fulfillment provider module docs to reflect CalculatedShippingOptionPrice

[ranjithkumar8352]

The return value below the example for the calculatePrice method is shown correctly as CalculatedShippingOptionPrice but the example is not updated in the guide "How to Create a Fulfillment Provider Module"

This PR updates the example in the guide and the TS doc

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[shahednasser]

Nice catch! Just a few comments, and please reflect those on the generated reference.

[ranjithkumar8352]

Nice catch! Just a few comments, and please reflect those on the generated reference.

Thanks @shahednasser, I have implemented the suggestions accordingly.

[shahednasser]

LGTM thanks!