update

Author: Philipinho

docs/self-hosting/ai/ai-search/ai-search.md

@@ -44,6 +44,7 @@ AI_COMPLETION_MODEL=<model>    # Model used for answering questions
 ```
 
 **Important:** `AI_EMBEDDING_DIMENSION` is optional and auto-detected from preset models. Only set it manually if using a custom model not in the preset list.
+The supported values are `768`, `1024`, `1536`, `2000` and `3072`
 
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