fix: preserve the original sentence

Author: rajephon

README.md

@@ -22,7 +22,7 @@ Click the image below.
 
 ### Streaming Parsing
 - Define schemas for streaming structured outputs using Pydantic-style models.
-- Receive granular, type-safe callbacks (`on_start`, `on_complete`, and `on_append`/`on_update` depending on type) as tokens stream in.
+- Receive granular, type-safe callbacks (`on_append`, `on_update`, `on_complete`) as tokens stream in.
 - Derive Pydantic models from LangDiff models for seamless interop with existing libraries and SDKs like OpenAI SDK.
 
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