Could someone tell me what the point of this return string is (adapted from [this example](https://d

const updateKvValue = async ({ key, value }: { key: string; value: string }) => {
    await env.KV.put(key, value);
    return `Successfully updated key-value pair in database`; //<-- this
};

const updateKvValue = async ({ key, value }: { key: string; value: string }) => {
    await env.KV.put(key, value);
    return `Successfully updated key-value pair in database`; //<-- this
};