Fix 25.2.0 changelog: correct ASGI parser optimization description

Remove inaccurate BytesIO claims - the callback parser uses bytearray directly.

docs/content/news.md

@@ -27,8 +27,7 @@
 ### Performance
 
 - **ASGI HTTP Parser Optimizations**: Improve ASGI worker HTTP parsing performance
-  - Read chunks in 64-byte blocks instead of 1 byte at a time for chunk size lines and trailers
-  - Reuse BytesIO buffers with truncate/seek instead of creating new objects (reduces GC pressure)
+  - Callback-based parsing with direct `bytearray` buffer operations
   - Use `bytearray.find()` directly instead of converting to bytes first
   - Use index-based iteration for header parsing instead of `list.pop(0)` (O(1) vs O(n))