[KV] add note on bulk reads for pricing (#22207)

Author: thomasgauvin

src/content/partials/workers/kv_pricing.mdx

@@ -1,18 +1,26 @@
 ---
 {}
-
 ---
 
-import { Markdown } from "~/components"
+import { Markdown } from "~/components";
 
 Workers KV is included in both the Free and Paid [Workers plans](/workers/platform/pricing/).
 
-|                 | Free plan<sup>1</sup> | Paid plan                         |
-| --------------- | --------------------- | --------------------------------- |
-| Read requests   | 100,000 / day         | 10 million/month, + $0.50/million |
-| Write requests  | 1,000 / day           | 1 million/month, + $5.00/million  |
-| Delete requests | 1,000 / day           | 1 million/month, + $5.00/million  |
-| List requests   | 1,000 / day           | 1 million/month, + $5.00/million  |
-| Stored data     | 1 GB                  | 1 GB, + $0.50/ GB-month           |
+|               | Free plan<sup>1</sup> | Paid plan                         |
+| ------------- | --------------------- | --------------------------------- |
+| Keys read     | 100,000 / day         | 10 million/month, + $0.50/million |
+| Keys written  | 1,000 / day           | 1 million/month, + $5.00/million  |
+| Keys deleted  | 1,000 / day           | 1 million/month, + $5.00/million  |
+| List requests | 1,000 / day           | 1 million/month, + $5.00/million  |
+| Stored data   | 1 GB                  | 1 GB, + $0.50/ GB-month           |
+
+<sup>1</sup> The Workers Free plan includes limited Workers KV usage. All limits
+reset daily at 00:00 UTC. If you exceed any one of these limits, further
+operations of that type will fail with an error.
+
+:::note
+
+Workers KV pricing for read, write and delete operations is on a per-key basis. Bulk read operations
+are billed by the amount of keys read in a bulk read operation.
 
-<sup>1</sup> The Workers Free plan includes limited Workers KV usage. All limits reset daily at 00:00 UTC. If you exceed any one of these limits, further operations of that type will fail with an error.
+:::