Update react-native.md

[Halleys123]

useSDK is now modified and connect, terminate options have moved to sdk object inside useSDK function

Description

This PR updates the usage of useSDK from @metamask/sdk-react to reflect the recent API change where connect and terminate methods have moved inside the sdk object returned by useSDK.

Changes made:

Updated destructuring from:

const { connect, terminate, account, chainId, ethereum } = useSDK()

to:

const { account, chainId, ethereum, sdk } = useSDK()

• Updated wallet connection logic from await connect() to await sdk?.connect().
• Updated wallet disconnection logic from await terminate() to await sdk?.terminate().

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