Updated NextJS "Client-side data fetching with RLS" Documentation

Updated the Client-side data fetching with RLS Documentation since `ThemeSupa` is not imported from `auth-ui-react` anymore but imported in `auth-ui-shared`

Author: dinogomez

apps/docs/pages/guides/auth/auth-helpers/nextjs.mdx

@@ -185,7 +185,8 @@ export default async (req: NextApiRequest, res: NextApiResponse) => {
 For [row level security](/docs/learn/auth-deep-dive/auth-row-level-security) to work properly when fetching data client-side, you need to make sure to use the `supabaseClient` from the `useSupabaseClient` hook and only run your query once the user is defined client-side in the `useUser()` hook:
 
 ```jsx lines=10-17
-import { Auth, ThemeSupa } from '@supabase/auth-ui-react'
+import { Auth } from '@supabase/auth-ui-react'
+import { ThemeSupa } from '@supabase/auth-ui-shared'
 import { useUser, useSupabaseClient } from '@supabase/auth-helpers-react'
 import { useEffect, useState } from 'react'