Update workers routes validity

### Example URL(s)

https://developers.cloudflare.com/workers/configuration/routing/routes/#validity

### Actual Behavior

The docs clearly state that a route pattern must include the zone name:

https://github.com/cloudflare/cloudflare-docs/blob/b9e1d40d3260bf3fa9d3bd627cc968277878ab4c/src/content/docs/workers/configuration/routing/routes.mdx?plain=1#L133-L135

### Expected Behavior

Cloudflare for SaaS has long recommended a `"*/*"` route pattern:

https://github.com/cloudflare/cloudflare-docs/blob/b9e1d40d3260bf3fa9d3bd627cc968277878ab4c/src/content/docs/cloudflare-for-platforms/cloudflare-for-saas/start/advanced-settings/worker-as-origin.mdx#L23-L28

This pattern doesn't include the zone name, but it works great! So I'm guessing the workers routes doc is just outdated.

### Additional information

_No response_