Docs: Updated v0.25.3 release notes draft (#14899)

### What problem does this PR solve?

Draft v0.25.3 release notes

### Type of change


- [x] Documentation Update

docs/release_notes.md

@@ -15,6 +15,7 @@ Released on May 13, 2026.
 
 ## New features
 
+-  Data source and parsing: Added column-level semantic/metadata control for the spreadsheet file parser; introduced ETag optimization for incremental synchronization of S3 data sources to avoid unnecessary file transfers.
 - Enables assigning specific roles like content, metadata, and primary key, to table columns. [#13710](https://github.com/infiniflow/ragflow/pull/13710)
 
 ## Improvements
@@ -23,11 +24,17 @@ Released on May 13, 2026.
   - Continues the transition of web APIs to RESTful conventions, ensuring backward compatibility for all legacy endpoints.
   - Binds the `user_id` in `POST /api/v1/messages` to the authenticated JWT principal. [#14745](https://github.com/infiniflow/ragflow/pull/14745)
   - Secures the sandbox executor against dynamic and indirect code execution bypasses. [#14690](https://github.com/infiniflow/ragflow/pull/14690)
-- Reduces ingestion server boot time. [#13894](https://github.com/infiniflow/ragflow/pull/14894)
+  - LLM request timeout control
+  - High concurrency blocking call thread pool
+- Reduces ingestion server boot time. [#14894](https://github.com/infiniflow/ragflow/pull/14894)
 
 ## Bug fixes
 
 - Images in multi-sheet Excel workbooks were not scoped by sheet, causing images to be incorrectly attributed across different worksheets. [#14120](https://github.com/infiniflow/ragflow/pull/14120)
+- Iteration item alias passing
+- Tool parameter template parsing
+- Code execution attachment output
+- Volcano model addition fix
 
 
 ## v0.25.2