Reflect LLMIntentClassifier removal in docs

Author: maksim-m

docs/docs/llms/llm-intent.mdx

@@ -14,9 +14,13 @@ import LLMIntentClassifierImg from "./llm-IntentClassifier-docs.jpg";
 
 <RasaProLabel />
 
-<RasaLabsLabel />
+:::warning
 
-<RasaLabsBanner version="3.7.0b1" />
+The experimental `LLMIntentClassifier` described on this page has been removed in Rasa 3.10. Please use the
+[Conversational AI with Language Models (CALM)](https://rasa.com/docs/rasa-pro/calm) instead.
+CALM is an LLM-native approach to building reliable conversational AI.
+
+:::
 
 ## Key Features