add caution note about BETA (#2678)

Author: gfletcher-cll

src/content/chainlink-functions/resources/simulation.mdx

@@ -76,3 +76,11 @@ To simulate:
 
 Follow the [Simple Computation](/chainlink-functions/tutorials/simple-computation) guide to learn how to import the [Chainlink Functions Toolkit NPM package](https://github.com/smartcontractkit/functions-toolkit) into your JavaScript project to simulate and execute a Functions request.
 You can read the [Examine the code section](/chainlink-functions/tutorials/simple-computation#javascript-example) for a detailed description of the code example.
+
+<Aside type="caution">
+  Chainlink Functions is still in BETA. The use of secrets in your requests is an experimental feature that may not
+  operate as expected and is subject to change. Use of this feature is at your own risk and may result in unexpected
+  errors, possible revealing of the secret as new versions are released, or other issues. Please be aware that Chainlink
+  Functions does not control how your secrets or environment variables are used or accessed within Remix or when
+  executing scripts within Remix, and the safekeeping of secrets and environment variables is your responsibility.
+</Aside>