[Email Routing] Clarify email sending is not available on free plan

Author: thomasgauvin

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

@@ -216,10 +216,10 @@ For more information and [examples of Durable Objects billing](/durable-objects/
 
 Sending emails through [Email Workers](/email-routing/email-workers/send-email-workers/) is available on the Workers Paid plan.
 
-|          | Included    |
-| -------- | ----------- |
-| **Free** | 0           |
-| **Paid** | 3,000/month |
+|          | Included      |
+| -------- | ------------- |
+| **Free** | Not available |
+| **Paid** | 3,000/month   |
 
 ## Vectorize