Merge pull request #1011 from o1-labs/feature/actions-reducers-warning

Add Actions and Reducer production warning.

docs/zkapps/writing-a-zkapp/feature-overview/actions-and-reducer.mdx

@@ -15,6 +15,7 @@ keywords:
 ---
 
 :::caution Warning
+The reducer API in o1js is currently not safe to use in production applications. The `reduce()` method breaks if more than the hard-coded number (default: 32) of actions are pending. Work is actively in progress to mitigate this limitation.
 
 When creating updates to unknown accounts in a reducer function, care should be taken to avoid introducing security vulnerabilities.