Update revenue_tracking.md for React Native

[solidw]

Pull Request/Issue Resolution

Description of Change:
ReactAppboy.logPurchase has different parameter type. I updated it based on appboy-react-sdk and example.

Closes #nothing

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• Yes (Insert Feature Release Date Here)
• No

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[solidw]

logPurchase's parameter type.

export function logPurchase(
  productId: string,
  price: string,
  currencyCode: string,
  quantity: number,
  purchaseProperties?: object
): void;

[solidw]

Minor issue about logPurchase function in React Native document.
@timothy-kim @KellieHawks

[KellieHawks]

Thank you!