docs: add export to provider example in microsoft-entra-id.mdx (#12790)

Update microsoft-entra-id.mdx

added export for microsoft-entra-id provider

Author: TyTheTechie

docs/pages/getting-started/providers/microsoft-entra-id.mdx

@@ -66,7 +66,7 @@ AUTH_MICROSOFT_ENTRA_ID_ISSUER
 import NextAuth from "next-auth"
 import MicrosoftEntraID from "next-auth/providers/microsoft-entra-id"
 
-const { handlers, auth, signIn, signOut } = NextAuth({
+export const { handlers, auth, signIn, signOut } = NextAuth({
   providers: [
     MicrosoftEntraID({
       clientId: process.env.AUTH_MICROSOFT_ENTRA_ID_ID,