docs(examples): Remove shield from rules (#613)

docs(examples): Remove shield from rule

examples/nextjs-14-react-hook-form/app/api/submit/route.ts

@@ -1,5 +1,5 @@
 import { formSchema } from "@/lib/formSchema";
-import arcjet, { protectSignup, shield } from "@arcjet/next";
+import arcjet, { protectSignup } from "@arcjet/next";
 import { NextResponse } from "next/server";
 
 const aj = arcjet({
@@ -8,10 +8,6 @@ const aj = arcjet({
   // See: https://nextjs.org/docs/app/building-your-application/configuring/environment-variables
   key: process.env.ARCJET_KEY,
   rules: [
-    // Protect against common attacks with Arcjet Shield
-    shield({
-      mode: "LIVE", // will block requests. Use "DRY_RUN" to log only
-    }),
     // Arcjet's protectSignup rule is a combination of email validation, bot
     // protection and rate limiting. Each of these can also be used separately
     // on other routes e.g. rate limiting on a login route. See