Images Webhooks require a zone with a pro plan or above - add note for clarity

[mglewis]

As per the following community post: https://community.cloudflare.com/t/cannot-use-webhook-for-images-stream-bundle-basic-product/929569/3

Message is identical to existing note here: https://developers.cloudflare.com/notifications/get-started/configure-webhooks/

[cloudflare-docs-bot]

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