CloudCode page: add note about property

Author: cahofmeyr

usage/tools/cloudcode.mdx

@@ -186,6 +186,7 @@ The body of the request payload should look like this:
 
   * `batch` should be an array of operations from the PowerSync client SDK.
   * `op` refers to the type of each operation recorded by the PowerSync client SDK (`PUT`, `PATCH` or `DELETE`). Refer to [Writing Client Changes](/installation/app-backend-setup/writing-client-changes) for details.
+  * `table` refers to the table in SQLite where the operation originates from, and should match the name of a collection in MongoDB.
 
 The API will respond with HTTP status `200` if the write was successful.