Fix linting

lightrag/api/README.md

@@ -206,7 +206,7 @@ For example, the chat message `/mix What's LightRAG?` will trigger a mix mode qu
 
 ### Add user prompt in chat
 
-When using LightRAG for content queries, avoid combining the search process with unrelated output processing, as this significantly impacts query effectiveness. User prompt is specifically designed to address this issue — it does not participate in the RAG retrieval phase, but rather guides the LLM on how to process the retrieved results after the query is completed. We can append square brackets to the query prefix to provide the LLM with the user prompt: 
+When using LightRAG for content queries, avoid combining the search process with unrelated output processing, as this significantly impacts query effectiveness. User prompt is specifically designed to address this issue — it does not participate in the RAG retrieval phase, but rather guides the LLM on how to process the retrieved results after the query is completed. We can append square brackets to the query prefix to provide the LLM with the user prompt:
 
 ```
 /[Use mermaid format for diagrams] Please draw a character relationship diagram for Scrooge