[Email Routing] Remove free plan included usage for email sending

Author: thomasgauvin

src/content/docs/workers/platform/pricing.mdx

@@ -214,11 +214,11 @@ For more information and [examples of Durable Objects billing](/durable-objects/
 
 ## Email sending
 
-Sending emails through [Email Workers](/email-routing/email-workers/send-email-workers/) includes 3,000 emails per month on both the Workers Free and Workers Paid plans.
+Sending emails through [Email Workers](/email-routing/email-workers/send-email-workers/) is available on the Workers Paid plan.
 
 |          | Included    |
 | -------- | ----------- |
-| **Free** | 3,000/month |
+| **Free** | 0           |
 | **Paid** | 3,000/month |
 
 ## Vectorize