docs: fix 32 character long generation code snippet (#13372)

* Update 90-adapter-vercel.md

* Update documentation/docs/25-build-and-deploy/90-adapter-vercel.md

Co-authored-by: Elliott Johnson <sejohnson@torchcloudconsulting.com>

---------

Co-authored-by: Elliott Johnson <sejohnson@torchcloudconsulting.com>

documentation/docs/25-build-and-deploy/90-adapter-vercel.md

@@ -124,16 +124,16 @@ Making a `GET` or `HEAD` request with `x-prerender-revalidate: <token>` will for
 
 Note that the `BYPASS_TOKEN` string must be at least 32 characters long. You could generate one using the JavaScript console like so:
 
-```console
-btoa(Math.random().toString()).substring(0,32);
+```js
+crypto.randomUUID();
 ```
 
 Set this string as an environment variable on Vercel by logging in and going to your project then Settings > Environment Variables. For "Key" put `BYPASS_TOKEN` and for "value" use the string generated above, then hit "Save".
 
 To get this key known about for local development, you can use the [Vercel CLI](https://vercel.com/docs/cli/env) by running the `vercel env pull` command locally like so:
 
-```console
-$ vercel env pull .env.development.local
+```sh
+vercel env pull .env.development.local
 ```
 
 ### allowQuery