Remove beta feature warning from voicemail tool

Removed beta warning for voicemail tool.

Author: sahilsuman933

fern/tools/voicemail-tool.mdx

@@ -4,12 +4,6 @@ subtitle: Learn how to use the assistant-controlled voicemail tool for flexible
 slug: tools/voicemail-tool
 ---
 
-<Warning>
-  **Beta Feature**: The voicemail tool is currently in beta. Features and
-  behavior may change as we continue to improve this functionality based on user
-  feedback.
-</Warning>
-
 ## Overview
 
 The voicemail tool gives your assistant direct control over when and how to leave voicemail messages. Unlike [automatic voicemail detection](/calls/voicemail-detection), which operates independently of your assistant, this tool allows your assistant to decide when it's reached a voicemail system and leave a configured message.