Docs: Miscellaneous editorial updates (#8430)

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

docs/guides/upgrade_ragflow.mdx

@@ -87,6 +87,10 @@ To upgrade RAGFlow, you must upgrade **both** your code **and** your Docker imag
 
 ## Frequently asked questions
 
+### Do I need to back up my knowledge bases before upgrading RAGFlow?
+
+No, you do not need to. Upgrading RAGFlow in itself will *not* remove your uploaded data or knowledge base settings. However, be aware that `docker compose -f docker/docker-compose.yml down -v` will remove Docker container volumes, resulting in data loss.
+
 ### Upgrade RAGFlow in an offline environment (without Internet access)
 
 1. From an environment with Internet access, pull the required Docker image.

docs/release_notes.md

@@ -29,6 +29,7 @@ Released on June 23, 2025.
 ### Fixed issues
 
 - A memory leak issue during high-concurrency requests.
+- Large file parsing freezes when GraphRAG entity resolution is enabled. [#8223](https://github.com/infiniflow/ragflow/pull/8223)
 - A context error occurring when using Sandbox in standalone mode. [#8340](https://github.com/infiniflow/ragflow/pull/8340)
 - An excessive CPU usage issue caused by Ollama. [#8216](https://github.com/infiniflow/ragflow/pull/8216)
 - A bug in the Code Component. [#7949](https://github.com/infiniflow/ragflow/pull/7949)