docs(function): teach readers to list the sandbox's installed packages

The Python package set lives in the E2B template (mothership-shell), which is
not pinned in this repo — a hand-written list would be unverifiable and would
drift silently when the template is rebuilt. Instead the callout now gives the
one-liner that asks the sandbox itself, which is always current.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: ouiliame

apps/docs/content/docs/en/workflows/blocks/function.mdx

@@ -56,7 +56,7 @@ JavaScript runs in a fast local sandbox, or in an [E2B](https://e2b.dev) sandbox
 | **Best for** | quick transforms, JSON | data science, charts, complex math |
 
 <Callout type="info">
-Python requires E2B. It is enabled by default on sim.ai; on a self-hosted instance, enable E2B to see Python in the language dropdown. The sandbox includes the Python standard library and common packages like `matplotlib`, and any figures you generate are captured as images automatically.
+Python requires E2B. It is enabled by default on sim.ai; on a self-hosted instance, enable E2B to see Python in the language dropdown. The sandbox includes the Python standard library and common packages like `matplotlib`, and any figures you generate are captured as images automatically. To see exactly what's installed, run a one-line Function: `import importlib.metadata; return sorted(d.metadata["Name"] for d in importlib.metadata.distributions())`.
 </Callout>
 
 ## Examples