Mistakes in docs

[magick93]

Please review https://usebasejump.com/docs/billing#get-plans.

I maybe mistaken, but I think some of the Javascript examples are using the incorrect function name. For example:

const {data, error} = await supabase.functions.invoke('current_user_account_role', {
    body: {
        action: "get_plans",
        args: {
            account_id: "uuid"
        }
    }
});

current_user_account_role should be billing-functions.