Reverted some of the version changes (#5908)

### What problem does this PR solve?



### Type of change


- [x] Documentation Update

docs/faq.md

      / _, _// ___ |/ /_/ // __/  / // /_/ /| |/ |/ / 
     /_/ |_|/_/  |_|\____//_/    /_/ \____/ |__/|__/                             
 
-2025-02-18 10:10:43,835 INFO     1445658 RAGFlow version: v0.17.1-50-g6daae7f2 full
+2025-02-18 10:10:43,835 INFO     1445658 RAGFlow version: v0.15.0-50-g6daae7f2 full
 ```
 
 Where:
 
-- `v0.17.1`: The officially published release.
+- `v0.15.0`: The officially published release.
 - `50`: The number of git commits since the official release.
 - `g6daae7f2`: `g` is the prefix, and `6daae7f2` is the first seven characters of the current commit ID.
 - `full`/`slim`: The RAGFlow edition.

docs/guides/chat/implement_deep_research.md

 
 ---
 
-From v0.17.1 onward, RAGFlow supports integrating agentic reasoning in an AI chat. The following diagram illustrates the workflow of RAGFlow's deep research:
+From v0.17.0 onward, RAGFlow supports integrating agentic reasoning in an AI chat. The following diagram illustrates the workflow of RAGFlow's deep research:
 
 ![Image](https://github.com/user-attachments/assets/f65d4759-4f09-4d9d-9549-c0e1fe907525)
 

docs/guides/dataset/accelerate_doc_indexing.mdx

 - On the configuration page of your knowledge base, switch off **Use RAPTOR to enhance retrieval**.
 - Extracting knowledge graph (GraphRAG) is time-consuming.
 - Disable **Auto-keyword** and **Auto-question** on the configuration page of yor knowledge base, as both depend on the LLM.
-- **v0.17.1:** If your document is plain text PDF and does not require GPU-intensive processes like OCR (Optical Character Recognition), TSR (Table Structure Recognition), or DLA (Document Layout Analysis), you can choose **Naive** over **DeepDoc** or other time-consuming large model options in the **Document parser** dropdown. This will substantially reduce document parsing time.
+- **v0.17.0:** If your document is plain text PDF and does not require GPU-intensive processes like OCR (Optical Character Recognition), TSR (Table Structure Recognition), or DLA (Document Layout Analysis), you can choose **Naive** over **DeepDoc** or other time-consuming large model options in the **Document parser** dropdown. This will substantially reduce document parsing time.