Add note about experimental terminal command execution [Alex suggestion]

Author: jdorfman

docs/cody/capabilities/chat.mdx

@@ -168,6 +168,8 @@ Search results generated through smart search integration can be automatically u
 
 ### Chat responses
 
+<Callout type="info">Executing terminal commands for additional context is an experimental feature.</Callout>
+
 * Performs background searches for context
 * Retrieves full context from files, symbols, remote repos, and web pages
 * Can execute terminal commands (with permission) for additional context