Odd logic in Send SMS hook example

In this example, useWhatsApp will always be true. https://github.com/supabase/supabase/blame/315a39d1819ceac0373053b86a0abd77fefad156/apps/docs/content/guides/auth/auth-hooks/send-sms-hook.mdx#L591 This is because userPhoneNumber.substring(1, 1) will always be "" [substring](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substring#:~:text=If%20indexStart%20is%20equal%20to%20indexEnd%2C%20substring()%20returns%20an%20empty%20string.) will always return "" if the first two parameters are equal because the second param is the first excluded index. And then `includes` will always return true if the second parameter is ""