docs: remove repeated code snippet at the end of ChatMessage documentation page (#10050)

* docs: remove repeated code snippet

* update versions

---------

Co-authored-by: Daria Fokina <daria.fokina@deepset.ai>

Author: TaMaN2031A

docs-website/docs/concepts/data-classes/chatmessage.mdx

@@ -319,17 +319,3 @@ print(message.content)
 ## Use the appropriate property instead
 print(message.text)
 ```
-
-<br />
-
-```python
-from haystack.dataclasses import ChatMessage
-
-message = ChatMessage.from_user("Hello!")
-
-## LEGACY - DOES NOT WORK IN 2.9.0
-print(message.content)
-
-## Use the appropriate property instead
-print(message.text)
-```

docs-website/versioned_docs/version-2.19/concepts/data-classes/chatmessage.mdx

@@ -238,17 +238,3 @@ print(message.content)
 ## Use the appropriate property instead
 print(message.text)
 ```
-
-<br />
-
-```python
-from haystack.dataclasses import ChatMessage
-
-message = ChatMessage.from_user("Hello!")
-
-## LEGACY - DOES NOT WORK IN 2.9.0
-print(message.content)
-
-## Use the appropriate property instead
-print(message.text)
-```

docs-website/versioned_docs/version-2.20-unstable/concepts/data-classes/chatmessage.mdx

@@ -319,17 +319,3 @@ print(message.content)
 ## Use the appropriate property instead
 print(message.text)
 ```
-
-<br />
-
-```python
-from haystack.dataclasses import ChatMessage
-
-message = ChatMessage.from_user("Hello!")
-
-## LEGACY - DOES NOT WORK IN 2.9.0
-print(message.content)
-
-## Use the appropriate property instead
-print(message.text)
-```